Ability to use pistons/rotators in the editor

add the ability to test some parts in the editor without the need of geting out of it.
like a piston that needs to extend to a specific point, you would be able to extend it in the editor and adjust it to the right position,
similar to how you are able to open solar panels and cargo bay doors and edit their size/angle etc.
it would be useful for rotators, pistons,eletric motor and others.