I do all of those things and I don't feel bad one bit, especially when I play with the GAF crew.
Yeah I wouldn't do it though because it breaks the game as Jason even more. Just like Combat Stancing the doors, there really is no need. It's just one more thing that makes the match even more lopsided. Counselors need things to be able to use against Jason and actually create distance. It's pretty easy to juke the shots and avoid the firecrackers anyways.
(Because everyone is better than me.)