We had to make some 3/8" thick parts out of large ground 7075-T6 plates a few months ago, and making manual tabs for these parts (no way to hold in a vise, no sacrificial stock big enough, etc) was agonizing.
Tabs already exists in Fusion 360, and I believe InvHSM as well, and even though I don't see myself using it a lot, I have seen other requests for it and there are times it would be useful. This is a bog standard option in most CAM systems, and it should be in HSMWorks too.