Set available level in Content Taxonomy

+1 to this patch, great!! this is what i was lookin' for!

i agree that this is very cool, but would it be possible to implement further filtering, so that if you have three fields A, B, C and a tree like this:

1
1.1
1.1.1
1.1.2
1.2
1.2.1
1.2.2
2
2.1
2.2
2.2.1
2.2.2

you could have

A) has options of 1 or 2

if 1 is selected,

B) has options of 1.1 or 1.2

if 2 is selected,

B) has options of 2.1 or 2.2

if 1.1 is selected

C) has options of 1.1.1 or 1.1.2

if 1.2 is selected

C) has options of 1.2.1 or 1.2.2

etc.

ah, one more thing: can you provide a patch?