No way to spend a BH Monday.
Started the day reading a mail from someone about my mod_change_username thingy for Phorum. Decided it was high time I address the rather tight restriction on username formats (tighter than Phorum’s own).
Tested it with Phorum 5.1.15 while I was at it - and barring some anomalies in the upgrade it seems to work as expected. V1.2 now available in the downloads section.