I don't remember it having been discussed before, but I'm not here very often.

I found a good source for N810 OTG cables (he also has N800 OTG cables):
http://myworld.ebay.fr/business2828/
The best part is the price : $8 shipped worldwide

I received mine today, I tried it and it's really OTG, I don't need to put USBControl on Host mode, I put it in OTG mode, and when I plug a USB drive it's detected and the file manager opens it.

I'm not affiliated to this seller, I just bought him a N810 cable and am happy with it.