Ha! I played one-nil, goal, goal94 before I got hooked on CM2 with CM97/98 getting me through uni. I've tried loads of others, but keep coming back to FM and now FMM as I'm old and have less time
I'd love an extra bit of interest in building a good backroom team. I'd love a little extra coaching bonus back to coaches favourite teams / managers, so as a manager there are reasons to pick one coach over another. I'd especially like some depth around offering an ageing player a coaching role and getting a training bonus if you were his favourite player, the club his favourite, or he was a club legend (in terms of appearances, goals, etc) or a generation of youth having that coach as a favourite player.
I also think the recent enhancements to player personality is fantastic and it would be awesome to extend this into the backroom staff.
You might find the purchase of the training add on might be increased if your backroom team was a really good fit in other ways (Personality, club links, player links, etc) , but the coaches were poor and unlikely to achieve silver/gold badges...