But you can already just select one character out of the party and position him here and there as you wish. .
That's precisely the problem. You can ONLY select ONE character at any given time. You can't give group commands to a subselection of your party, which is what an "RTS-like" system would allow.
And YES, you can painstalkingly give detailed commands to each one of your men separately... With an awkward, convoluted and slow-as-hell UI that makes the process severely more time consuming than it could be.
Seriously, are you trolling me? Wasting my time on purpose? Deliberately pretending to not understand what the entire thread is about?