After deleting one of terms that was asosieted with feed and feed items i lost ALL seetings of categores to with feeds should insert new feed items. only ones that worked still was categores from auototaxonomy.
And after setting stuff one more time, i lost all assigments to categories from autotaxonomy.
Setting to update feed worked only for items that was still in the orginal rss but rest is lost.

Propositon to fix are 2:
- after deleting term from category setings are not lost
- option to leave categores aggregated with autotaxonomy by "Apply changes to already existing items"

thanx for your code!

if some one is feeling like fixing my horrible english grammar, please do so ;)