From Quake Wiki

Some useful DarkPlaces gameplayfix cvars collected under a new extension.

Default value is unspecified, recommended 0

sv_gameplayfix_blowupfallenzombies (findradius also lists SOLID_NOT)

sv_gameplayfix_findradiusdistancetobox (findradius finds the volume of bounding-boxes rather than the entity origin)

sv_gameplayfix_grenadebouncedownslopes (MOVETYPE_BOUNCE does not get stuck on downward slopes)

sv_gameplayfix_swiminbmodels (allows swimming in bmodels with a water texture)

sv_gameplayfix_walkonbboxes (allows walking on bounding-boxes rather than sliding on them)

sv_gameplayfix_walkoutofsolids (allows traces which start in solids to trace out of them)