> In the past I have requested the "mark whole thread" feature, not yet implimented.

That's not correct, it is implemented. Just add an attribute for that. Assume you have problem reports, so you 
add

Attributes = ..., Fixed
Options Fixed = boolean
Quick filter = Fixed

If you add a new entry, "Fixed" is false by default. All replies to that entry will contain then the same flag. 
Now if you want to mark the whole thread as fixed, do the following:

- go into list display
- display all entries in threaded mode
- click on "Select"
- select the thread you want to mark as fixed and click "Edit"
- now keep all attributes, but check the "Fixed" check box

and voila, the whole thread will contain "Fixed = 1". Using the quick filter, you can now show all fixed threads 
with one click.