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Even though, there is a command line interface on linux (which has start, stop and, soon, pause options), there seems to be no equivalent feature on windows nor on mac. This feature should be easily ...
I use reparse points (junctions). These folders do not propagate changes (as I'm sure you all now by now) and thus don't sync. Now, Dropbox patrols these folders and eventually syncs (which is 99% of why I am a Dropbox user, BTW). However, sometimes I would like to trigger a sync, for example after a backup runs, so I can check of the backup is fine and I can go to bed.
I could kill and restart DropBox, but that's bad for it (I assume) and also it leaves an icon in the try area every restart. For rarely supervized machines that's annoying at the very least.
Both these cases could be solved by a db_cli.exe that simply posts the command to the running instance if there is one. It could be as easy as putting the command you wish executed in a registry value and Dropbox patrolling it and executing it (then emptying the value).
Simple commands as "PAUSE", "RESUME", "INDEX" and "EXIT" will probably do.
I know this is a trivial issue, but Dropbox is generally a very good service and I have nothing else to suggest.