My code automatically switch vendor from LIME to LIMM when it detect a mod in some ways, they aren't necessarily bad; then I block bad mods while allowing other mods.

If you look in the logs then you can see that in the query there is "&client=LIME" but in my detection I set it to LIMM to make clear it isn't the original LimeWire.
My detection isn't perfect but it should be enough accurate in most cases.

PS: I was talking about prioritization in the hosts returned by the GWC.