Thank you very much for your kind words!
A & B – Very valid observations! I've noted both of these issues and already resolved for the upcoming release. Should be out by the end of this week.
Q1 – Short answer is no. The longer answer is maybe, but decent amount of work is probably required. Either a front-end script type of solution – like detecting if nothing is checked before the ajax request, check them, send the request and uncheck them after. ..or a back-end type of solution, using the 'asp_query_args' filter.
Q2 – There is a short (but incomplete) list within the plugin folder in the filters.txt file, also in the documentation here. And there is also a separate documentation about the asp_query_args filter.Best,
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