Showing list of questions form multiple category choose using shortcode

I am using your DW Question Answer plugin for creating a forum, it works well. But I am trying to show question list form some specific category chosen by me like  category=”hoodies, t-shirts, shirt, Pant”] etc but it not working when I use multiple category slag using comma separator. It work only when I use just one category like category=”hoodies”]. Is there any option so that I can show question list form that multiple category only.
Also is there any option as like above in ask question page, that only option to ask question for my selected category form dropdown category selection. 
Has anyone come up with a good solution for this?
Thanks!