I am also a user of ROS on Archlinux for a bit more than a year. But I use it only for my hobbies so not so regularly.
I am currently maintaining 193 packages for Indigo on AUR because they are packages that I were needed for some tests I have done.
The work made by Benjamin Chretien is amazing and allows us to easily add a package to AUR. But the updating process is a bit annoying so an automated build-system would be very nice.
I can help a little bit but I am following the Github issue from the beginning and there is nothing I can do to help for now (I am not a TU, neither I know anything about bloom and I do not have any web server).
So I am following the subject and if there is something I can do, do not hesitate to poke me!