Handling long sub-menus more gracefully

[tim hall]

Hi list.

I'm new to openbox,

I'm running ob3 on Debian/testing. I have a couple of sub-menus, notably
Debian > apps > system and Debian > apps > tools sub-menus that are too 
long for my screen.

For various reasons, I don't want to reduce the text size or use 
Debian's automatic menu configuration system to split them up into 
further sub-menus (or columns ;-). My ideal would be to be able to use 
the scroll wheel on my mouse to scroll the sub-menus up & down. AFAICS 
it is not possible to specify mouse-bindings in the context of the menu, 
or have I failed to understand the documentation?

I can deal with the .xml files and themerc format, but the hardcode is 
beyond me. I'm wondering if the xorStyle and/or warpPointer options 
would help me here. If anyone was able to explain if it is possible to 
configure the menu behaviour or at least make it jump around slower and 
where I would need to make these changes, I'd be grateful.

cheers

tim hall