There are so many examples of players (Jordan being the most prominent) who go away over the summer break and work on an aspect of their game and come back having greatly improved in it, whether it is their jump shot, post game, free throws etc. Naturally there are tons of others (the best example is Shaq) who do nothing in the offseason and come back a little worse and out of shape.
So without changing the entire BB universe's balance what if in the off season each team could choose three players to automatically get 48+ minutes training in one specific skill. They may all pop or none might.
So for my team I may decide Barton needs more passing (Sensational is never enough), Mu needs some inside defence and Kent really needs some free throws. Just click on the menu's (like they had at April Fools) and 48+ is theirs.
I would imagine this is a very low priority but perhaps the BBs can file it away somewhere for a rainy day.