Limit Concurrent Uploads
The ability to set a limit on the number of concurrent uploads would make uploading larger files so much easier and so so so less painful. With your abysmally slow upload speeds (taken 4 hours to upload 1gb) and constant crashing of the app (Mac OSX keeps signing out/disconnecting from the server if left unattended and/or I try use my computer for other things while its uploading in the background) I have had so many hash fails which is a waste of bandwidth and time.
Instead of having 6-7 files getting to 90% and then the app crashes, I could have 4-5 complete and then only having to re-upload 1 or 2.
When you include this feature, manually setting the limit is the best and most simple way, but you could also make an auto detect of large files, eg have the default at 5 but if the system detects a file is over say 50mb, it would automatically limit to 1 or 2
How did this only get 3 votes? This is the most infuriating thing! Allow limited number of uploads or at the very least, allow pausing of individual files without pausing entire sync.