Here is what the maker of uremote told me in his email:

That seems like a nice gadget for iPod, I must look more into it. However I
was wondering does it have as good accuratity and range as usb connected
ir-transceiver has. I could also do some research how to make an usb
connected ir-transceiver that can be plugged directly in to 770/N800.

Editing buttons in URemote770 is a bit touch thing to do in current version.
You have to manually edit URemote770.conf-file on 770/N800 and match it with the PCs lircd.conf file. The teaching process must be done with PC's
Lirc-software that runs on Linux. ( http://www.lirc.org/ )
However the graphical editor is being made. Once it's done there should be
editor that works with the principle "what you see is what you get". With
that the buttons can be drawn then dragged and dropped to the location on
screen that is wanted for button. So the editing should be a lot easier then.

--Kimmo Leppälä

So it looks like there is a bit more work to do before this can actually work!