I know the Dicota gamepad won't work with the HD2 despite it having USB Host support like the TG-01 but I was wondering if the reason it doesn't work is lack of power.

http://www.htcphones.net/htc-hd2-supports-usb-host/

As you can see USB Host DOES indeed work, but they had to hook up an external power source. Would using the TG01 stuff for the Dicota Gamepad (Or another gamepad for that matter) would powering it externally solve the issue?

I'm sure someone else thought of this but as I haven't seen anyone mention trying it, I thought I'd ask before running off to buy one.

The USB host is here, yes, but it's absolutly not powered up. The USB host of the TG01 is powered up.

So indeed, with an external power source, it may work, but I think nobody has tested the HIDgamep.dll (the one that allows the TG01 to handle usb gamepads, the one I was using on the tg01 for the dicota gamepad or other gamepads). the registry part that has to be modified to link to these drivers is the same on the HD2 and the TG01, that's already a good indication.

I've tried to power everything up using an USB host, but it's vain. The only solution is the one you see in the videos you've linked to your message: cutting an USB cable (or powering the dicota itself?) but I haven't tried so far.

Just note one important thing: on the TG01, using an USB gamepad was killing the battery very quickly, and the USB host function was stopping when the battery was under 30%
You could play muuuuch more time using the MSI BGP100 bluetooth gamepad.

So my dream would be to directly put a battery into the dicota, not to have a modified cable with an external battery at one end and the HD2 at the other. Such a system wouldn't kill the battery of the phone, what would be better than on the TG01.
I fear I'm not a good enough moder to do this myself

Yeah the idea was to mod a battery pack onto something once its all up and running. Might give this a shot with a gamepad tomorrow.

Edit: Something like this: http://www.bixnet.com/5v7libapa.html

I was looking for a very cheap MP3 player to steal its battery lol
(because I want something really small and not too expensive)