mikra's suggestion is mine as well.
Further thoughts: I just realized that A or D's level could be in between B and C's, so I would avoid this very configuration.
It's intuitive as something like a ramping mechanism in case you know you wanted one of the doubleclick modes. Currently you have to keep track of which was last used since it reverts to this last-used mode.Personally, I think that mikra's suggestion may be a bit too confusing for me, since I'd need to keep track of what mode I'm in and click then think about where it is going to go.
Further thoughts: I just realized that A or D's level could be in between B and C's, so I would avoid this very configuration.
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