Can you warn people that their Towny rent is almost due?
Solution 1:
I learned later that this is a feature request, but isn't an actual feature yet. Star the request and help get the developer's attention. =)
http://code.google.com/a/eclipselabs.org/p/towny/issues/detail?id=257&colspec=ID%20Type%20Status%20Priority%20Label%20Milestone%20Owner%20Summary