Hi Klaus, I'm glad you like it!

I do want to add some construction-plane tools into MoI, but I have postponed this until a future release after V1.

It might help me if I understood more of the reason why this was something you were looking for immediately - is it so you could draw on a vertical/elevation plane while still inside of the 3D view?

Re: select object to set construction plane - this will definitely be a part of the construction plane tools when they become available later on.

- Michael