In the menu on the EX3, there are fast and slow settings for zoom.
Does this apply to the rocker zoom on the lens, or the handle zoom on the camera?
It would be great if I could set my zoom speed at a constant slow speed for an
up and coming shoot.

If you read the manual you will find that applies to the handle zoom only.

You can set the high speed and the low speed settings in the menu, for the handle switch.

You can also set up 2 scenes and have a custom zoom and focus change automatically executed.

The manual is a good thing, read it.

RTFM! Thanks, I'll give it a whirl.