Flat 2D geometry plane selection

Having the ability to select which plane the Flat 2D operates on could be a useful, time saving feature to have. 

For context I'm using shapes for some prototyping targets, zones and other related indicators in a top-down type game. I'm applying rotations to all the objects to get them on the XZ plane. Of course it's not a massive issue, just a bit repetitive.

I guess it could be both a global and per-object setting. Maybe there is already a way to do this and I'm being dumb.

Either way, love this tool. It's been super useful especially for a lazy person such as myself.