The 5 posts/4 hours isn't too bad.  What's more annoying is it seems you've blocked the entire range of IP addresses used by 3 (mobile broadband supplier here in the UK).  So noone can sign up from that broadband supplier because some scammer used them in the past (that's the message I got when I tried signing up direct from 3).

Hi,

Been lurking here for a while - finally got round to registering.  Should have done it ages ago really - then wouldn't have this 4 hour wait