I believe, on the editor you have set up for spells, you need something like this
Code:
<inputthing
name="Spellweaving Talent"
helptext="Specify which spellweaving talent this spell belongs to.">
<it_taglist group="Helper" tag="IsWeaving"/>
</inputthing>
That would produce the list of anything tagged with
Helper.IsWeaving, but it wouldn't limit it to just Talents with that tag. For that, you might want to create a
Talent.IsWeaving tag (instead of the Helper version) for use in this. Then, if Talents are the only thing tagged with the Talent tag group, you'll only see Talents in that list.
That help?