Re: Is there a limitation in showing the options on the drop down menu (Kickstart Form)?
I'd suspect it's more likely that Activiti is not able to handle one or more of one of the values - perhaps a special character or unusual format. I doubt there's any specific limit. The source code is on github at GitHub - Activiti/Activiti at 6.x but your best course of action is probably to try it first with a few values and progressively add values until it breaks and then look at the particular values that you added when it broke. Or the details of the error message if they're available.