Perhaps you could put the second URL in a different field in your profile?
The software is very modifiable and I also have the source code, I could figure out how to make the change, but for the most part, I like to run the forum "out of the box", without trying to make a lot of modifications. There are several reasons for this:
1. Every modification we make needs to be repeated when we upgrade the software to a new version;
2. Every modification invites ideas for new modifications;
3. I want to spend more time actually reading Greek and less time administering the site;
4. Feature requests for phpBB really should be directed to the phpBB people so they are reflected in the upstream source, are also available in future versions, etc.
I do things that seem like a lot of bang for the buck - getting the fonts right, adding support for youtube, I need to look into why PDF attachments aren't working - but I'm a bit lazy about other things.
ἐξίσταντο δὲ πάντες καὶ διηποροῦντο, ἄλλος πρὸς ἄλλον λέγοντες, τί θέλει τοῦτο εἶναι;