I want to increase the movement speed of the actors during combat, but it seems that my changes take no effect. I edited the following movement types:

NPC_Default_MT - this should be for walking and running
NPC_1HM_MT - 1-handed weapon drawn?
NPC_2HM_MT - 2-handed weapon drawn?
NPC_Attacking_MT - attacking 1-handed
NPC_Attacking2H_MT - attacking 2-handed
NPC_Blocking_MT - while blocking

I set the left/right speed on running and walking to 500 in most of the types, which is as fast as sprinting in vanilla. No visible changes... Editing forward/backward speed works well, and I also got the sideways movement to work with 800 once, which was a little faster.
Does anyone know anything about the movement types? It looked straight forward, but apparently it's not.

My goal is that the player can move backwards fast while blocking, move forward fast while attacking and strafe fast while neither blocking nor attacking.

It could be down to the weapon attributes.

The weapon speed attribute affects it, yes. Values of 800 left/right still did not make any difference with a speed 1.0 weapon, so my workaround is that I increase set the MovementSpeedMult when the actor has his weapon drawn and I toned down the forward/backward movement