First let me say, I work with Media Hut (no1pokerroom), and so far, theyre great!
onto private freerolls..
Titan, they wont accept every1, Some ppl they tell no, some they sign.. I dunno what makes the difference.
Absolute, easy to get ..
The best way to get private freerolls, is to email each and every aff manager you have, tell them what you want.. how many players you can provide.. What date and time you want the tourney, and what password you would like to use.. Give them your url. It never hurts to ask, my momma swore to me the word no alone wouldnt kill me.. so far so good 
Pokerworld does 1 per forum as well .. btw..