I've found one that works with Transmit 5 but a window has to be already open.
Found it on:
http://maclog.ldblog.jp/archives/50831311/
I wish the author would list it on Packal or this forum...
I've been looking for a workflow like this! However, I noticed that it only inserts '12:00 am' as the time.
rm test;tomorrow;10:00
rm test;tomorrow;10
rm test;tomorrow;10am
etc, doesn't work?