So, you're still stuck with that thing...
Is there any way a coder cam change this so they won't have to do any router setting changes?
No. Read about how port forwarding and routers work:
http://portforward.com/help/portforwarding.htmIt's not something on UT side that can be changed.
As I said already (was it a year ago? lol), I can try helping you to config your router via remote assistance. Get Teamviewer and contact me when you see me online (on Xfire/playing).
There's could also be other blocking factors, such as ISP.