Yes, there are various areas of Synch management which could do with improvement, I agree.
Currently, you should be able to select the scheduled sync in the queue drawer then click the Clock icon to change its settings, including its schedule. This doesn't allow you to change the paths, though.
You should be able to set an ignored file by using the Filters - exclude the exact name of the file in question. Again, this is an area for improvement that's planned.