I'm fairly new to this but will have a go - as I understand it (from ama1's post) the game expects a total maximum on 71 teams in the following sections: 23 international teams, 30 European club teams, 14 super rugby teams and 4 'representative' teams. More than this and the game starts to consistently crash.
This version of the mod has the following teams/leagues:
- All 12 Gallagher premiership teams (although Saracens are currently in Championship due to salary breaches and Newcastle is missing from the list - next season there will be 13 prem teams, Saracens/Cornish Pirates/Ealing Trailfinders most likely to go up) - all 12 are found in 'European' section
- All 12 Pro12 teams (although there will be 16 teams next season with addition of 4 SA super rugby teams)- 11 are found in 'European' section and 1 Connacht is found in 'Representative' section
- 12 out of 14 Top14 French league teams- the missing ones are Bayonne and Agen (Agen and Castres were last in pro14, Perpignan and Vannes were first in d12) - of these 12 there are 7 in 'European' section, 3 in 'International' section and 2 in 'Representative' section
- All 5 NZ super rugby teams - all in 'super 14' section
- All 5 AUS super rugby teams (incl. Western force) - 4 in 'super 14' section, Western force in 'representative' section
- All 4 SA super rugby teams - all in 'super 14' section (these four will be moving to Pro12/pro16 next season)
- Cheetahs - in 'super 14' section (were playing in pro14 along with Southern Kings but both removed this year and will be replaced by Bulls/Lions/Stormers/Sharks next year)
- 20 international teams - pretty much 20 best international teams, the other 3 spots are taken up by the three French clubs Pau, La Rochelle and Lyon (as no space for them in the 30 European club spots)
So as you can see fairly comprehensive list and sticks to the above mentioned 71 team limit (+section specific team limits)
In terms of missing national teams the mains one for me would be:
- Russia - probably best international team not on the current mod (Georgia, Romania and Russia likely qualify to Europe 1/2/3 spots for RWC23) (in Peter83 version)
- Hong Kong - Japan qualified so next best in Asia, has a chance to qualify for RWC if beats Samoa/Tonga (big if!)
- Spain/Portugal/Netherlands/Brazil/Belgium/Germany etc. - sort of best of the rest, don't know much about... (watched a couple of match highlights on 'Rugby Europe' YouTube channel, production values are not the best but it's something) (some of these in Peter83 version)
In terms of missing representative/special teams:
- British and Irish Lions - would be the key one for me, best quality team that is missing from mod (in Peter83 version)
- Barbarians - unique team, secondary one for me (in Peter83 version)
- Māori All Blacks - again pretty unique team (in Peter83 version)
- World Rugby XV - would love this
- Northern Hemisphere XV - same
- Southern Hemisphere XV - same
- North Island - historic team played again in 2020, great match
- South Island - same
- few others such as French barbarians etc.
In terms of missing clubs from the main leagues:
- Newcastle - current Gallagher prem team (in Peter83 version)
- Bayonne - current top14 team (in Peter83 version)
- Agen - current top14 team (no promotion/relegation so again next year) (in Peter83 version)
- Fiji Drua - potentially in super rugby next year (in Peter83 version)
- Moana Pasifika - potentially in super rugby next year (in Peter83 version)
- Sunwolves and Jaguars no longer have funding (slightly worried for Argentinian rugby, big exodus)
In terms of main missing leagues/competitions:
- Lions Tour (to SA maybe...)
- Rugby Championship (SANZAAR) - sort of in there already (Tri nations) but no Argentina
- Japan Top League (JAP) - needs another 16 teams (@Sromero above is working on this and MLR, see few posts above)
- Major League Rugby (USA) - needs another 12 teams (@Sromero above is working on this and Top league, see few posts above)
- Mitre 10 (NZ) - needs another 14 teams
- Currie Cup (SA) - needs another 7 teams
- National Rugby Championship (AUS) - needs another 8 teams
Basically, as I understand it, to add any of these to the game not only do you have to do the work with the roster, kits, logo etc. but you have to cull a team from one of the current 71 teams available. I'm not sure how to change teams about at the moment so will be sticking with current list for now as its covers vast majority of what I want.
Note the version of the mod by Peter83 has more teams including the British and Irish Lions but has a lot of crashing issues so I'm using ama1's version as it is much more stable despite not having quite as many teams.
By the way none of the work on the mod was by me so just summarising what I understand is and is not in there right now
If I had to do it with these limits and sections I might go:
- International (x23) - top 20 international teams qualifying to RWC23 + British and Irish Lions + Barbarians + World Rugby XV/Māori All Blacks
- European (x30) - 12 prem (same as current w/o Newcastle), 8 of the pro12, 10 top14 (w/o Agen, Bayonne, Castres and Pau/Brive)
- Super 14 (14) - 5 NZ, 5 AUS, 4 SA (w/o Cheetahs)
- Representative (x4) - the other four pro12 teams (maybe the 4 Irish teams)
Not easy...
On stars I'm not sure how to directly tell who has a star other than go in to a game and I don't know how to assign star players with the specific abilities but I know you can list the star next to a players name but editing their name in Woosahs rugby editor (see other threads) and adding a ^ symbol to the right hand side (e.g. Johnny Sexton^) - not sure if there is a reason why this is not there (i.e. not sure if doing this mucks up anything in the game)