This update fixes the bypass of the forcing of the server resourcepack by just pressing ESC in the prompt screen. By adding a prompttimeout config option you can now set in how much seconds a player needs to accept a pack before counting his reaction as declined. (Default is 15 seconds)
This stops players from bypassing the server resourcepack prompt by pressing ESC in it. (Somehow Mojang didn't thought of sending a status packet there... I will open a bug report for that so maybe they will implement that in a future client version)
You can also set a different reaction on the TIMEOUT status independently from the DECLINED status if you want that. If no extra reaction on the prompt timeout is set the declined status will be used instead.