Actually gmic has a "fav" button that may be used to save a VERY FEW preset

more then a few "favs" would totally screw up the usability of the filter list :
the filter list looks already a bit hard to browse even if the filters are all grouped in subcategory , alas
fav can't be "grouped" as normal filters, their list is always expanded

Just counting my own presets i created about 50 (all quite different each others) for each filter i wrote , that means more then 600
more i created presets for several other filters i use often ... let say at least another 150
Could you image the effect that would have in the gmic filter list the addition of 650 new entries that can't be organized in subcategory to toggle or expand (as the normal filters ? )

Let say that more then a dozen of presets start to be hard to manage , as now will be totally impossible manage 650 (or even 100 )

Commands added under "Filters->Artistic".