Is it Possible to move layers?

I don't know if this can be done, like offset one of the layers, or at least move all the objects inside a layer let's say 50px to the right.

Well there is the "is on layer"- condition..

so it would be easy to:

sprite is on layer 1

sprite set x = sprite.x+50

or

system pick sprite where sprite.layernumber = 1

sprite set x = sprite.x+50