Artillery Combinator is my new mod that is basically this mod but targets with artillery instead of pinging the map! Thanks for making such a great code base to build on (some credits to me for the bug reports though)! I released my fork under MIT since this mod is under MIT, though I usually go for GPL otherwise.
Look at my mods code to see how easy it is to tint images in pure code without altering the images. The map pinger looks like a constant combinator and it's quite qonfusing.