no , you just need h-e-n package from extras devel , and power kernel v46 , and a usb female-female adapter and the stock n900 cable ..
and of course a device to test..
if you are going to use an external keyboard or mouse , there are packages for these to work properly in extras devel : extmou and extkbd
for further help ,you may want to check out the usb host mode original thread , and the support thread ..