He can't do a Kage bunshin in battle but the chance that he can do it at 100% health and chakra, I'll say yes. I'll say he can ONLY, do it for a short limited time though. I bet after doing such jutsu, it has to drain most of your chakra pretty quick. Remember that Kakashi only did it to intimidate and overwhelm the enemy. The reason they made it forbidden, was due to a high rate of deaths and also so that they wouldn't have fodder ninjas embarrassing themselves.