I need some clarifications for your proposal.

First, do you mean setting the maximum number of brought but not yet signed players are 2? So that the number of players is 22+2?

If yes, the flexibility that I am enjoying will be limited. But I dislike but do not strongly object.

Second, do you think some managers buy weak players, leave them unsigned (because they have full squad), and enjoy lowering team quality?

It do not rule out the possibility that competition drawings are affected but I personally do not believe. The manager herself will see that the team average quality is lowered as the qualities of new weak players are calculated. However, when another manager view this team, the average quality will not be affected by those unsigned players because their qualities are excluded in calculation. So it is quite possible that unsigned players are not considered in some situations.