During your tenure of BMS you will find hidden config options that most people don't know about, this is a list of such config options that we have found on forums or through our own testing.
Basic colours can be changed by pressing ctrl+alt+shift+c. Alt+C will save that setting, which you can load on next start with alt+l.
For more advanced colour changes use this:
For each different aircraft there is a seperate 3dckpit.dat file you need to edit.