With Firefox Sync, I can synchronize bookmarks between Firefox on my PC and my mobile devices. I have thousands of bookmarks however, most of which I don't need while on the go, and the volume of bookmarks brings my main mobile device (Nokia N900) to a painful, grinding halt while syncing (which is automatic).
I'd prefer very much to only synchronize "mobile bookmarks", which I can organize when at a desktop PC.
So my question is: is there any way to control what gets synced or to exclude certain items from the sync process?
Edit: Since it appears Firefox Sync doesn't offer such functionality, and Xmarks isn't supported by my device, I'll pretty much accept any answer that improves over manually copying bookmarks over. Even if the "synchronization" would require a USB cable.