I know it sucks. But it is security precaution which can save our ass ...and players deposits. Most of payments realy goes instant but if it meets some criteria system will hold em until we approve.
Developing for bitcoin is very hard and if you manipulate with bitcoins in instant manner your games should be virtualy bug-free or you will loose all in couple milliseconds. And you see this in realtime - most games eventualy disappear because of hackers theft (or scam). Every day i register at least five skilled people trying to hack my games. I was robbed at least three times when i started (and being dumb also).
BUT I will set limits little more free, your withdrawal should be ok even without manual approval....