I've been firing off a fair number of square prints that are annoying to cut/break free of full brims, but could use the adhesion help. In an effort to make it easier, I've turned off brims and manually placed small 1-layer-thick, 10mm circles at each corner of the print. The results are even more effective than a traditional brim, and a lot easier to remove.
Is there any way this could be implemented as a custom adhesion helper type? For these kinds of prints, it's a HUGE improvement…