How to lock player colour options but allow race selection?

Level 12
Jan 8, 2015
Hi, i have issue getting it to work on multiplayer, for some reason map locks settings to forced random race with locked colours on there while in singleplayer i can select race as i intended. Is there any way to force people to have set colours but keep option to choose race(for gui/music)?
I have set player races in scenario to "selectable" and set fixed player options in sides/teams tab. If there is no way to fix it for multiplayer maybe there is other way to get result i want?(race selectable but colours fixed)