why complicated metadata if you can already do [inlet~ channel1] and [outlet activity] in an abstraction/subpatch? afaik arguments to those objects currently are ignored, but i do use them sometimes to make me remember their function.
$1 $2 and $3 of [inlet~] and [outlet~] are already reserved for the resampling feature (specific to DSP). This feature was introduced a few years after the inlet-tooltip feature was introduced.
you mean like a block~/switch~ object? never heard of those features
before (I don't follow up all changelogs, so if it's not documented, I
don't know it).