Well after using BSP a good bunhc in Leadwerks 3, it's a REAL PAIN to change UV with buttons or inputs
I mean if you must spend hours, days in BSP levels, let's make 3D level designer it's life lot more happy , fun and easy with UV mapping adjustemnt on BSP.
So why not doing like Blender or other UV mapping tools, and propose the minimum :
A windows or panel showing the texture and the selected face UV mapped, and we could move vertices or edges, scale them or rotate all points at same time.
An example talks lot more :
I think this is one big point, taht is lacking, and make you stop from going full BSP interms of speed and workflow.
It would be the ultimate thing BSP really really need.
Specially if you have 2048*2048 texture containing "sub" tilled independant textures you want to use.
(one file texture = optimisation in memory and loading).
We are in 2013, not in 1998 (Half Life game), this is 15 years now we should have visual tools also.