Simply add a bar similar to the aura and the shapeshiftbar to the right of the pet bar.
This bar contains buttons to cast the aspect of the hunter (the bar is only visible for hunters)
You can use the context menu to change many settings.
Spec switching is managed automatically. When the second spec is activated for the first time, the settings are duplicated. Then, all changes made to the configuration are only done to the current spec, and the inactive spec is untouched.
/floaspectbar panic|resetReset all settings and reload the UI
/floaspectbar unlockUnlock the bar so you can move them.
/floaspectbar lockLock the bar in place
/floaspectbar auto(default) use an automatic placement of the bar at the bottom right of the screen. Detect optional action bars, XP bar, reputation bar.
/floaspectbar scale <ratio>Scale the bar by a <ratio>.
/floaspectbar bordersShow borders (default)
/floaspectbar nobordersHide borders /fab is an alias for /floactionbar