You could use the password for "settings", which is currently unused.
I would really like to donate to you on a regular basis and more so automatically.
I agree. Using the password to offer a percentage to be kept for donations is a great idea.
It will help out Luke-Jr and still give miners a choice to donate or not.
Something like:
Password = any three digit number = $donation
$donation = Percent kept by pool.
So, if I send a password as
030, then 3% of my earnings would be donated.
021 = 2.1% donation.
Min
000 (0%) Max
999 (99.9% wow)
Any thing else in the password should be ignored as normal.