The definitive gameplay enhancement mod for the GZDoom and Zandronum engines. Adds realistic gore, dismemberments, headshots, executions, lightning effects, particles, makes enemies smarter and harder, makes gun louder and beefier, and adds epic new boss battles.
UPDATE 1: now compatable with BD rc2 Improves weapon sights idle animations. Also features the red shotgun reskin made by IDDQD_1337 and updated by me.
RC3 has brought with it "hybridized" ironsight hold/toggle functionality, might have to update this again, due to the heavily-modified code for the SMG, MP40, Assault Shotgun, Standard Shotgun, Assault Rifle, Rocket Launcher, and Railgun.
Umm Please Tell Me How to Aim
This addon is veeery outdated, but you aim down sights using the Alt Fire button.