Archer bombard I haven't used in awhile so im not sure. If you have selected it in the BUG menu (have the little box ticked) then it should work. If its ticked but you can't press (B) and then bombard with your archers, then something is wrong.
Archers have not been able to bombard for many versions now. I think it dissappeared when we moved to the latest RevDCM.
If you want that option changeable in multiplayer check how Afforess did the syncing of the AND options (mainly using MODDEROPTION for the state and sending a net message whenever the BUG option is changed).I may have inadvertently found and fixed the problem there (with a little help from Koshling.) What I find frustrating with the option as well is that its a Rev option thus I can't manipulate it in a multiplayer game (which is most of what I play) without doing some process I never can remember how to go about considering how many files we have in the mod. I was thinking... if its fixed, it would benefit from being moved to another 'type' of option. I'll circle around and start really trying to fix it if it isn't fixed by my adjustment already. (it was asking if a unit was an archer in a way that wasn't very functional for an ongoing mod in development.)