Wont your best scorer still take most shots as it is now? And saying he should take even more shots would probably just end in him missing a lot more shots?
I don't know what your point being, but I'm sure you didn't read my explanation.
Here is the summary of all that (again) - in real-BB there are:
1) Clutch moments.
2) Clutch players - who play better at those moments (shoot, drive, defend or whatever...).
3) Clutch minutes special play - going to the best clutch-moments' player or using him as a decoy and going to another player.
4) Clutch minutes' defence plan - going "harder" on the clutch player, keeping defence stand, or changing it.
This game should adapt those features.