@qix77
I'm on 4.2.1 and I can confirm that ZDoom is ready and waiting under the 'Optional Packages'. As far as 'Brutal Doom' goes, I have it installed and it tends to run pretty well unless you have the enemies cranked all the way up to 'Nightmare' and do something like throw a grenade into an occupied room. Then it has to work out where all the blood an body parts are going to fall and the game will stop until it does. Playing it on 'Hurt Me Plenty' seems to run very well though. You should be able to install it without issue using the Documentation for ZDoom.