admin theme ovverrides selectable regions

i have my admin theme set to garland, but my default theme set to a custom theme. when i go to set the node as block options per content type, since this is an admin screen it is displayed in garland. because of this my allowable regions list is limited to those defined by garland.

this is a real problem since i have a lot of other regions defined in my custom theme are are inaccessible via this module.

i've done a little digging and it looks like this related to the init_theme() call at ~line 59 in the module. perhaps this is because it only collects info from the current page? or maybe there is a bigger issue to blame?