Would it be desirable to add a new button action to persist a list filter 
directly into a DataTiddler, with the row number as the index?

I can construct a DataTiddler like this manually using:

* A count of entries from a filter
* A range up to the count, subtracting one from each to make it base zero
* Re-run the first filter, butfirst<current range value>, first entry
* Set-field action to save the filter result to a DataTiddler, using the 
current range value as the index

If the range filter exceed 10,000 records, this process cannot run. Even 
when I break the process out into smaller chunks, the throughput gets very 
slow after 20,000 records.

Does anyone else think this could be useful when trying to pre-process a 
large amount of data?

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