Hey guys, I was wondering if it was possible to use nitrous hooked up to the throttle and a separate system hooked up to a button at the same time.

Hell you could have a nitrous system hooked up to your dick, but as with what youre asking, whats the point??

If you mean to be able to switch between activation methods, then yes it is possible...you just gotta wire/plumb it up to support both. If you mean to have dual shots, then go ahead and buy a new engine cause youll need it in about a week or so.