Thanks for the feedback!
Yeah, Rally only affects units once they die and respawn, and currently it's only possible to select living units. I'm planning on allowing the selection of respawning units for the purpose of setting their rally point (and later-on, changing their class), and I suppose I could make Rally double as a move order for units in the spawn zone.
Clicking and dragging on the minimap to quickly pan is a good idea, I'll be sure to add that to the next major version.
I'll check out the bug on Tempest, thanks for the heads-up.
Edit: Bug fixed in newest version.