It's done. Sub-sat/vB fee settings merged into Bitcoin Core v30.0 to be released in October.
In case you cannot wait. Add to bitcoin.conf:
minrelaytxfee=0.00000100
incrementalrelayfee=0.00000100
But mind that not alot software out there that already support sub-sat fees. @craigraw has it in Sparrow Wallet's master branch, probably expected in next release version. Also not alot of bitcoin node will relay sub-sat fee transactions right now or right from the start of v30. For now you might need some luck to get them through to miners.
GitHub
policy: lower the default blockmintxfee, incrementalrelayfee, minrelaytxfee by glozow · Pull Request #33106 · bitcoin/bitcoin
ML post for discussion about the general concept, how this impacts the wider ecosystem, philosophy about minimum feerates, etc: https://delvingbitc...
