Hello,
as I need a small proxy (non-caching proxy) running on my Asus
(because I am lazy to switch my proxy off when I am at home and not at work)
I have managed tinyproxy working on Oleg's 1.9.2.7-7g firmware.
Probably it will work also on older releases, but I just started with this one.
If there is an interest to include it into firmware release (next one?),
I can share my experiences.
I have attached proposed tree within install dir (before target) of firmware.