FileBot

Excellent stuff. I've only just discovered FileBot and amazed at how well it works and how versatile.

I'm running this command on a Synology DS215j as a scheduled task. I'm using the Synology to download torrents via a RSS feed. Is there any way to create a trigger (such as completed download) oppose to using scheduled task?

That depends on which download program you use. The amc manual does include setup instructions for most of the popular tools.

I'm fairly certain the Synology Download Manager doesn't support calling 3rd party tools on completed downloads at this point. But you could ask Synology to add that a as a feature in the future.

I'm using the Synology Download Manager. Any other options?

P.s. Just donated $20 USD. Again, great app.

Or folder watching options?

1.
You can probably run any of the usual suspects, e.g. rtorrent, deluge, etc.

2.
On a normal Linux systems you'd just use inotify but on Synology you're probably out of luck:
http://unix.stackexchange.com/a/24955/78608