I am currently working/experimenting with these tp link wr703n (soon gonna buy alfa router and flash pineapple, and tp link tl-wr720n pocket router) and I came across this idea, what if you're able to do the internal usb hub mod same as the tp link wr703n.
I am sure someone has done this already? If so, I figured it would be a popular mod.
https://forum.openwrt.org/viewtopic.php?id=34188
I am definitely going to try it when I get mine.