you need edit core i think, but i dont know really how
its a long time back i had worked with servers. :-\
if you dont get help on mxc, try http://l2jserver.com/forum/
or the l2j irc chat, they will help you im sure.
i have found on l2jserver forum this topic but they didnt help so maybe write there too someting and they will help http://www.l2jserver.com/forum/viewtopic.php?f=74&t=24778&p=144980&hilit=raid+boss+move#p144980
tip: the irc server is freenode and the channel is #l2j
PS: Bobi , i want help from you with the GPU/egp its working now but i dont know how to use it. can you come last time to my teamviewer? thx. and gl with your server project ;)