@fireblizzard After I started to making new telehop maps noticed that there is issue with direction of speed per destination at some maps, I got fixed it by new spawnflag in 721ea2e commit.

FGD class:

@SolidClass base(Trigger) = trigger_teleport : "Trigger teleport" 
[
	spawnflags(flags) =
	[
		256: "Keep angles" : 0
		512: "Keep velocity" : 0
		1024: "Redirect velocity with yaw from destination" : 0
	]
]

Mapper should select one of four yaw (0, 90, 180, 270) at angles of info_teleport_destination to redirect player velocity to right way.

Clips with demonstration (BXT HUDs enabled to see angles & velocity at different axis):

Old behaviour

New behaviour

Juice showed me a proper solution for keep velocity in all directions, now it's not hardcoded to only few directions as I did before.