I wonder, if I can somehow setup message's font and duration in Vavoom C? I found out, that there are no older SetMessage and SetYellowMessage funcs, but bprint, cprint and centerprint. I tried original Hexen maps and discovered that yellow messages are overriden by centerprint in Vavoom (toggled some quest chain-levers). But it is white colored and have lesser lifetime, than original Hexen yellow message. Can I change this in my code? - I underline that I do not want to change executable code, so I am asking about progs code only.

It's handled by the engine, so you can't change that, only duration which is controlled by console variable center_message_time.