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The way I see it working is letting us set up a filter (which we can now) and click a button to set it as our default filter. From then on when we go to the maps are it will show that custom filter by default. Selecting one of the default "tabs" (Hot Maps, Active Authors, Featured Maps, Random) and then clicking the button would set the default filter the same way that tab is set up.
This would be useful for those of us that find ourselves consistently changing our map filters every time we go there.
Allowing multiple saved filters would rock, but I realize that would take much more work.