The following will be posted on the Eligius, BTCGuild and P2pool threads.
How willing are the pool operators to implement this? Is it hard? Any downsides? Please discuss
I looked into it a long time ago, but at this point I'm not looking at touching the code which handles payouts. If something goes wrong, there is no way the pool would recover from the loss without it affecting the users.
And from that explanation it seems to me that may divulge enough information to help discover your original private key being that the range of sequential keys are based on it. It's not good security policy to divulge any more information than absolutely necessary.