I would do the following:

1. Change the training so that there is no upper limit (currently level 91) or it takes longer to get there (but the training rewards are better) - they also need to ensure training doesn't produce mutants no matter how much money / tokens / rests you spend

2. Youth / Academy players - why would I want an 18 year old that's at 62% - surely my maxed out training could give the odd 'worldie'?

3.Make the ceiling % for every player 100%

4. Ensure that you don't face the same 6 league opponents each season

5. Sort out the assistant manager so that the advice given can be acted upon to potentially alter the match results

6. If you make tactical changes in a match these should have a bearing on the actions on the field

7. Stop illegal formations such as 2 defenders, 2 midfielders and 6 attacking midfielders / strikers

That's all for now - I'll probably think of more when I've sent this!