I think another use for the "last time active" would be for people who need to ask for help. (You don't want to ask someone for help if they haven't been on in the last 5 days.)
I like the idea of Webriddler currency! I can't wait to edit my member title!
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Another suggestion: the ability to PM multiple people, unlike on
forumer where you can only PM one user at a time
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For the Phase Timer idea: maybe the profile can have a section called "Riddling Stats" and that can show how long the person spent on each phase. Maybe even graphs that show the trend! I don't know how hard that is on the web, but it is sure easy in Microsoft Excel!
Maybe there can also be something that shows a phase's average solve time. Though the problem with that would be if someone took a break from WR for a month or so because of something as unimportant as final exams.

and also phase 1 and 2 would be thrown off by n00bs. Maybe it can be based solely on the time a person is logged in!
This is an amazing thing Jax is doing.
by the way, is matchu actually registered in the new webriddler? or is that just a Jax -*test*-('")ing out the registration process?
-pi