Acidfree taxonomy

Is there any way to create or set the parent dropdown used by acidfree to show just a main category or categories? For example currently our intented list of catorgies was set to four options, however whenever an album is created using one of the categories a sub album is created thus making the listed categories huge. Category one currently has 40 sub items listed before category two is shown with its 60 sub items listed (see example below).

If acidfree is unable to just show the main categories from one taxonomy is there a way (an if so how) to show multiple category/taxonomy's to choose from when creating an album?

ie:

What is currently going on:
Add album

Parent:

-Category 1
--sub item 1
--sub item 2
--sub item 3
-Category 2
--sub item 1
--sub item 2
--sub item 3
-Category 3
--sub item 1
--sub item 2
--sub item 3

What we want:
Parent:
-Category 1
-Category 2
-Category 3

Will live with:
Parent:
-Category 1
--sub item 1
--sub item 2

Parent:
-Category 2
--sub item 1
--sub item 2

Parent:
-Caategory 3
--sub item 1
--sub item 2