Is there any reason why you are putting things in the radar entity grid instead of, say, just making the radar entity faster?

There's also a (minor) risk that some other mod might decide to remove the default grid equipment names you are using.

When I wrote the mod I couldn't figure out how to get the radar-spider to move faster. You are right, there is a risk for compatibility issues, but I will cross that bridge when I get there. At the time it was more important to finish the mod than trying to over-optimize.