Spoiler:Instead of or in addition to the normal intermission screen (a setting that can be changed), at the normal end of a level a security camera view of a large sector in the level pans back and forth with kills and secrets displayed. FIRE or JUMP goes to the next level. This is in beta since I'm still working on the HUD stats, but it's playable. I've not extensively tested this, but it should work with any level.
There could be a few problems in its present state. I'm not sure what happens at the end of a mission, but I've left an option to turn off the end cam for those levels (E1M9, etc). Placement of the camera (for now a single security camera) is determined by a random point close to the center of the sector. Depending on the chosen sector's shape, this could look strange, but it should avoid solid walls. Finally, I make an assumption that map names are in ExMx or MAPxx format, so it won't work if the lumps are otherwise named. It also assumes map progression is numerical and will otherwise ignore MAPINFO e.g. E1M1 goes to E1M2, etc.
Ideas I'm considering: several security cameras that switch randomly; more complete HUD stats (although who cares about par time, for one?). Maybe this is an opportunity to make this screen more interesting.
Update: This works OK with vanilla Doom. One of the mods I'm using is breaking this... Load order issue.
Spoiler:Now at v1.2