Hello @Charles_Cushman1,
the metafields don‘t help?
Especially the „last modified on“ since you wanted to be able to filter based on the last change.
How about setting up stages for these?
Follow up #1
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For the tasks awaiting approval you can also use the approval feature in Asana.
That is correct. Text fields don‘t work in rules yet.
Here is the relevant feedback request thread to upvote: Rules set Custom Fields with Text or Numbers
As another workaround you might wanna have a look at Flowsana.