Currently, you can specify --dev-block-time when running the omninode locally, but there’s no option to use instant seal mod, i.e., automatically sealing a block for each new transaction.

We maintain our own node and runtime in ~/substrate/frame/revive/dev-node so that we can run a node with instant seal.

Adding instant seal to the omninode would make it possible to use it instead, removing the need to maintain our own.