I could certainly make use of that for some of the sequencing I do, the shift key option is is news to me

Thanks for clarifying.
I'm thinking of an improvement here that might help the OP - could this dialog also include the option to match the effect duration to the mark duaration? You can import a mark with a duration (show the Mark Bar to see them), but there is no option to match the effect to the duration of the mark. You can only choose to span between each mark and the next mark. Generating the list of times from some kind of midi capture software should be fairly easy.
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