The OmniFocus applescript library doesn't directly offer a list of tasks in exchange for a perspective name, but you can certainly define custom lists by editing the clause in the script above which reads:

flattened tasks where next is true

and you can use a post on this forum (which lists applescript clauses for the OF various filters) as a cookbook from which to assemble your own recipes. For example:

flattened tasks where (flagged is true) and (estimated minutes <= 30)

or

flattened projects where ((status is active) or (status is on hold) and ((effectively hidden of its folder is false) or (its folder is missing value)))

(You can use the Where in OF script to test these recipes before using them in a custom applescript).

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