Dear Xara...

I have checked all the way back to v11 and I find the I can only apply a single Animation Effect to a given Layer from one or more shapes.
This is despite the text that indicates that you can apply different effects, one each to any shape:
The Animation dialog is non-modal, which means it can stay on screen while you select different items on the page. Click the Apply button instead of the OK to keep the dialog on screen. You can then select another item to change the animation on that without having to re-display the dialog.
Can this omission be rectified.

Xara - FAIL Mouse-over Animations.xar

Acorn