Ok, Look at the Puzzle Bridge Tutorial for example. If i wanted to make the puzzlebridge.xml file a plop and play addon, I would need to be able to define the spawnable area to relative coords to the spawner's (X,Y,Z). I tried SETONTHIS/X1_Y1/(<GETONTHIS,x>,<GETONTHIS,y>,<GETONTHIS,z>) and SETONTHIS/X1_Y1/(GETONTHIS,x,<GETONTHIS,y,GETONTHIS,z) Both of those gave me the X1_Y1 is not properly formatted, As I assumed it would. But I wanted to try it before I posted. Then I thought about using variables, but realized I had no idea how to use them to achieve this.
It might be a nice feature to add something like this:
(Photoshoped Image)

and have it null out whichever one you are not using.
Just a thought Arte, I know you have a lot of things to do as is. I just thought this might be a fairly simple feature to add, And usefull as well.