FYI, discovering who might be "new person hunting" about Manhatten in a Titan is very easy to discover from a server admin standpoint.
Step 1, reasonable chat attempted with offender. Step 2, reasonable chance given to offender to change their ways. Step 3, warning given if compliance to the better good of the community is not seen immediately in their actions. Step 4, kick from server. Step 5, offender continues with the "hunting"...banned for life. Sounds simple enough to me.
The alternative is to gang up on them (this concept has been tried in other MP gaming formats and just doesn't seem to work very well). Another alternative is to turn off the PK capabilites, but that seems a bit rude to other pilots that might be wanting that to stay on and don't camp out above Manhattan.