Change player jump height

[jokyaku]

This is turning out to be a little harder than I thought it would be. I know about Defines.jumpheight but this changes the jump height for every player which would be undesirable. What I'm trying to do now is adding a multiplier to the speedY of the player when he jumps that way the jumps are sligthly higher but I would be glad to know if there's a better way of doing it.

Edit: I decided to lock the player speedY to -6 for longer while he's jumping and that seems to work pretty well. Help no longer needed.