MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Muzz64, one suggestion, could you design a new companion "thing" that only prints the text and make that customizable so people can enter whatever they want.
Then people can print the blank sign with surrounding border in one .stl file and the other "thing" with text in another .stl file.
This would allow users to load both of those into Simplify3D (or whatever slicer) and be able to print duel colors easily or just put them together and have customizable text. It is easy to just change the position of the text .stl file in the slicer to sit on top. You can even post the exact Z height.
I can easily just get the text part using something like Tinkercad but this may help others that don't know how to do that.
It would also help you by not having to keep adding new text options. :)