I'd like to raise awareness for the mirv_campath command supported both by AfxHookGoldSrc (Half-Life 1, Counter-Strike 1.6, Day Of Defeat, ...) and AfxHookSource (Counter-Strike: Source, Day Of Defeat: Source, Counter-Strike: Global Offensive), which have been introduced with HLAE 18.104.22.168 (2014-11-07T19:38Z).
For GoldSrc games this adds easy campaths to modifications that don't have DemoEdit's CAMPATH supported (i.e. Day Of Defeat, Natural Selection, Adrenaline Gamer, ...).
For Source this adds easy campaths to i.e. GOTV demos that wouldn't have campaths otherwise and also can be used to make proper third person camera paths for POV demos, see this link.