As shadows are the settings with most performance impact, could you provide an independent setting to shadows cast by characters on the ground?

The problem is: In low shadow settings the game has best performance but characters dont have shadows. In medium shadow setting character have shadows and game becomes more beautiful, but we can see a significant impact on performance. Could we be able to control more specific shadow details to fine tune the game visuals/performance, like enable or disable just character shadows in any shadow settings(low, med, high and things like that)?