I'd love to take control of an entire region in a rugby union, and play with each team from the ground up throughout the year, all the way up to the national side of the country that union is in. For example...
I could take control of the Taranaki Rugby Union (in New Zealand), and select from the local players a squad for the Taranaki team of the Air New Zealand Cup. Then, after the Air NZ Cup season is over, I'd move on to the Super 14 region that Taranaki is in (the Hurricanes), and select my squad from the available players in the unions that feed into the Hurricanes, as well as any other players that were not protected by other rugby unions. Then after the Super 14 season finished, I would move on to the All Blacks and select players for the team, and then play test matches, tours, and even build up for a world cup every 4 years...
Wow, I would play literally 30 years in that mode... I dunno what you'd call it, maybe "Union Manager Mode" or something. But I think it'd be great. The same could be done for teams in other countries that have domestic leagues that feed larger leagues and national teams, i.e. Munster playing in the Magners League and Heineken Cup and then move up and select the side for the Irish national team.
Would anyone else be interested in this mode? Man, I'd buy that rugby game RIGHT NOW.