Erase entity ? Is possible ?

[Acies]

Go into the modeleditor. Open the Key, save it as "Key_Jumping" or something. Remove player collision on the body of the key.

Place that key in your map. Works.. Hopefully?

Edit: You might want to remove all collision (so the player doesn't toss something at it). If it's the case that the player can't pick it up with collision removed; create a scriptarea at the location of the key. Enable interaction with that area. Interaction = get key & remove interaction possibilites with area.