Do not allow them in solo. Allow them in group. I am saying this because in solo no its not fair for bombs to be used, in group warriors will own top 10 lb if bombs are disabled and no mage or rog will get there. Bombs are what allows rog and mage to get high scores so don't disable bombs in group.
Warriors get high scores because those enemies will hit you for 30000+ damage and we have ultis + procs that buff our hp and armor so we can survive. Thats enough to one shot war no proc. Imagine using a rogue. Mage has a shield but rog doesn't.
I am a warrior saying this fyi. #4 group lb currently we did a 4 war pt no bombs except I used 1 on wave 114 and died. It was a mistake. Stunning enemies while my procs were active; mainly ebon aegis. Never a good idea.