The problem is that, unlike an airport, an overlay has to be "cut" to the DSF tile boundaries. This is made slightly tricky by the fact that the overlay can have (1) bezier curved segments and (2) a UV map on those segments. My existing toolkit of polygon editing routines doesn't handle this case yet.
I have no idea when I will have time to complete this code. It is the number one piece of code that, if I had a quiet single afternoon of unexpected time to code, I'd pound it out. If I were stuck in an airport with my laptop, I'd pound it out. It should give you some idea of how busy things are that it still isn't done.
In the meantime, there is the scenery tools bugbase. By filing a bug, your issue won't get lost even if it's a while before I get to it.
A few quick rants about the bug base:
- Most likely the first thing I'll do when I do get to your bug is just ask you for more info. Consider the bug to be as much a business card so I can make contact as well as a bug report.
- Some bugs may get kicked out.
- Do not file X-Plane bugs in the scenery tools bug base! The scenery tools bug base is not where we store sim bugs.