dont oversimplify it
would be good if you could do clever lineout and scrum moves as well as back moves. and also if winning scrums and lineouts had some complexity to them as in real rugby
the AI is the main thing i think, getting the players who dont have the ball to pick good lines of running, take the right man in defence etc
use a trick stick feature similar to fifa to get the players to step in the direction you move the joystick, but in a less exagerated way than in previous rugby games, ie. if you pull the stick right the player takes a sharp step to the right, then have a different button for hand-offs/dipping the shoulder in the tackle, as in fifa all about timing it
passing distance should be directly related to time holding the button, not just an option of skip one, so if you hold it long enough with good passers you can pass half the width of the pitch if there is a player in a better position and if you tap it quickly it will just flick it on
a chip-and-chase style kick is needed, since the other buttons are taken for lob, punt, drop goal and grubber maybe say for example lob and L2 will give a quick chip over the top if you tap it, but if you power it up more it can be chipped into space for your oncoming backs, similar to the way the other kicks are proportional to power applied
would be good if you could use this modification in other ways 2, like x and L2 is a low spiralled punt as the likes of ronan ogara would often use, as opposed to punting over the full-back, or triangle and L2 could be used for a powerful grubber to put your winger through instead of a short grubber from the player kicking the ball
if theres anyway the physics could be more madden-like that would be great, that way the angle of running is important as players cant just swerve direction instantly if theyre wrong-footed, and the hits are more varied depending on the angle you go for the player at
thats it!