Yes, currently app has perfomance issue on folders with a large number of files. We are working on fixing it.
You can tell BTSync to automatically sync all files in sync folder, just touch on a blue circle with white arrow near the folder at the Sync view. A folder settings menu will be appeared.
Also you can cancel download now, just swipe on downloading item and "Cancel" button will be appeared.
This is exactly what I was looking for, but it is not at all intuitive. It took me over an hour of google-fu to find this information -- I'm putting in a request that this setting be placed elsewhere, or the circular button be modified. At the moment it just looks like an icon that indicates that you can go into the folder itself. Other than that I love this app!
BitTorrent Sync for iOS Bug reports and feature requests
in Sync General Discussion
Posted
This is exactly what I was looking for, but it is not at all intuitive. It took me over an hour of google-fu to find this information -- I'm putting in a request that this setting be placed elsewhere, or the circular button be modified. At the moment it just looks like an icon that indicates that you can go into the folder itself. Other than that I love this app!