Plugin Grabber Add mode

I would like to use plugin grabber to create multilayer instrument and than just tweak it.
Workflow im thinking of: use plugin graber to grab one instrument and use it again , again , again … just dont remove samples …
Does anybody else think having “add” instead replace samples in current sampler instrument is a good idea?

(im thinking of a checkbox in plugin grabber dialog)

p.s.
another solution would be to easyly merge two or more instruments