u wanna give it one time or wich each lvl over lvl 155 ? i mean only with 155 or with 156 also with 157 also and so on ?
on now i would have 2 ideas that both must be possibel.
first way:
Create a NPC with lvl check. That Npc checks the level from a player and give him famepoints ( use flags that he get only one time the famepoints)
example here
http://www.lomcn.co.uk/forum/showthread.php?t=53022
that the easiest way i think.
another way is create a line in 00default. that makes lvl check and give u fp ( for that u have much staff to read here (mostly in mir2 section)
gl
ameno