I've had a bit of discussion with several hikers about the prominent but unnamed pass clearly visible across from Mweni Pass. It is a magnificent, steep, grass gulley topping out near the summit of Pins Pass at the co-ordinate S28 53.475 E28 58.859 (WGS84). Access from the bottom is a little further up from Chichi Bush Camp and the start of Pins Pass. Following the river is a little tricky because of waterfalls, and so traversing on the true left sloped a little higher up is easier.
It is named "Manxsome Pass" in
http://www.geocities.com/supertraverse/ where a detailed description is also given.
I know that people have climbed it and it is not "new" as such.
Please feel free to supply any information which you may have on it, and share if you have climbed it and/or named it.
It would be great if we could agree on a name for it.