it seems that you can.
Also what kind of them do you want,some mercenary units from other countries used by Byzantines and Ottomans(aka.Serba,Latin Empire etc.) or units used by these 2 main mod factions?
I will happily make them and help you.
Btw i'd really like to make some Serbian mercenaries,if i have a permission though.
And i have downloaded this patch for bots,now can you help me,how can i make them and add equipment and stuff,hmm?