Quake Combat+ is a refinement & continuation of Quake, SMC & Quake 1.5, built on Darkplaces, aiming to provide the ultimate Quake singleplayer combat experience and perfect the existing works without straying far from the original design/balance to retain compatibility with the many great custom-made user maps out there.
A proximity grenade pickup is by luck found in the very first secret of the game.
Quake 1.5's Proximity Grenades have been polished up in many ways, and are slightly more common usage throughout the game without upsetting balance.