The function handling the 1.2% is an exception in the tax module. What you are asking is to expand further this emergency hack.
The functionality you are after can be handled using the existing chain distribution module (https://lcd.terra.dev/distribution/parameters) with the aid of a contract that facilitates the regular airdrop to a DEV/DAPPS pool, once a DEV POOL has been allocated and a method to its’ access/control has been agreed.
Refer here to get an idea how the distribution module works, and here for a sample of a distribution contract.
I hope this helps.