MU dice commands ought to show every individual die's results.
This part I agree with, if for no other reason than I have seen dice code malfunction in weird ways. Having an extra layer of 'make sure all the moving parts are moving correctly' is good, and some systems have special rules based on how the dice come out. If you're going to generate the numbers, there really isn't a reason not to show the numbers generated.
They ought to also allow players to change the colours of their dice so you can do something of a virtual version of flinging a recalcitrant one away and digging out another.
This part I am not with you on. Jesus, players already get wild with eye-searing ansi in names and comtitles and stuff, can you imagine what kind of painful rainbow vomit we'd see if they could change the colors of everything and make other people see that shit too?
Better to just do this in your client.