As AMF files support color, and as OpenSCAD has partial support for color, and as 3D printing is about to move to multi-color (mixing nozzles), it would seem to make sense to export color values to the AMF files.
On the same note, for the last reason, it might also make sense for OpenSCAD to move to AMF as it's main file format, instead of STL?
Hmm, deja vu again :)
Once #1608 is done, then multi-color AMF, STL etc becomes quite possible.
There isn't really a "main format", the conversion to STL is the last step of export, it is not used as an internal representation. So all you could do is change the order of entries on the "Export" menu.
Interesting, I am glad to hear that last part. #1608 look quite long, so will read it another time, as I am quite tired...
Any progress on this?