Virtualbox-OSE version 4 support usb. Here the steps you may follow:
1.- launch Vbox-ose 4 and make a filter for each usb you want to run inside the virtual system. Edit the filter for each usb chaging option 'no' to 'any' on the 'remote' option.
2.- go to system > administration > users and groups and add yourself on the 'vboxusers' group.
3.- logout session or reboot your system and enjoy your vbox-ose with usb capability