What about running the Windows browser version via WINE?
I could do that i suppose, its not really a big issue though as i upload each file after every ride.
I think if i left it a while and wanted to do batch uploads then i would want some way of using the garmin plugin (i have a windows partition on my laptop which i can use for that if i need to though - but it's a lot of hassle to restart, boot windows, upload files, restart again)