So curiosity has got the better of me and I've requested for people to test a few things, this is a development thread created for USB OTG and getting it to work.
What we know:
The snapdragon s4 soc support otg (running all the time reads mdm as usb device)
Slimport support OTG
kernel supports OTG
Unsure about ROM
This is created from my mobile device, when i receive net access ill update this more
Kernel i built 2 weeks ago or so, supports OTG
If anyone with an OTG Cable can test and provide both logcat and dmesg when plugging in a device, to make it easier would prefer ps3 controller connecting. Ontop of that do 2 tests 1 without supplying power and 1 with supplying power.
Newer kernel http://devhost.xda-developers.com/o0O
Installation ZIP, http://devhost.xda-developers.com/o0O
Works on any ROM
Remember to modify build.prop and add ro.usb_host=1