I will add multiple columns as well as the filtering at some point.  Same for pets.

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I have a suggestion for the filter.  It would be nice to have the ability to choose
two (or more) of your mounts (flying and ground) to set as favorites, so that the
button will display just those options, instead of every mount you possess.  Also, an
option to arrange the mounts in terms of priority (IE, flying at the bottom of the
list while in Outland, and epic mounts listed closer to the button than regular
mounts) so as to speed up the mount choices.

A filter would be nice but an option for RANDOM mount or Pet would also be wicked

I would love a feeature like this, my mounts popup is a bit mental too :D

A filter or a custom button bar (where you can add items of your choice) would be 
great, this addon will be perfect and must have so !
Thanks for the work

I was thinking it would be good to to (lets say i have the bar on the right hand edge 
of my screen, vertical and the bar opens to the left) have the bar pop out (left 
horizontal) with types of mounts. ie horse ram cat etc, then as you hover over the 
type of mount a new autobar opens (either up or down in this case) with the different 
types (of horse ram cat etc)

This would be big increase in utility