rasppi as piratebox + modify usb content remotely

Hello everyone,
first of all really thank you and compliments to you for the great great job done here! The piratebox is an amazing thing! :)
Now the question: just as an introduction, i've to say that i'm pretty noob in firmware development and raspberry too...but i wanna learn! ;)
I want to start a new project where i will need the raspberry working like a piratebox (with the wifi dongle, as i read in the forum, it should be possible) but, simultaneously, connected trough an ethernet wire to a router, to have internet connection (also this, read in the forum, it should be possible) and connected to a usb storage to take the files from; now: is it possible to remotely connect to the router and change the usb content? i mean: is it possible for me, from my home, change the content of the usb pen connected to the raspberry directly from the web and through the router? Do i need to modify the router firmware? Do i need to modify the piratebox code? Or is it sufficient to use the code posted here (forum link) and use the upload capability already present in piratebox?
Thank you so much in advance and sorry if i have been so lenghty!

Marco.