You should really just be able to say
"I would like to manage the ptr records for my assigned ip block using my own name servers. My name servers are as follows: ns1.yourdomainname.com ns2.yourdomainname.com"
When i ask to DC for rDNS subdelegation they replied with this:
The Delegation for XXX.XXX.XXX.0/24 has been set and you are able to control the settings for the Block.
Looking at the source to the config parser, pDNS will only read a line up to the # and there doesn't look to be a way to quote/escape the value. Best bet would be to change your password to not include #'s