If you lease, forging is completely 'fire and forget' for the leasing period. No need for a running node or open client once you've set it up.
There are a few pools around, I run a forging node with a few leased balances, but all that income gets used for Nxt stuff, mostly to faucet top-ups, so leasing to me is really donating your forging power and income.
Check out ForkedChains pool, they actually make regular payouts of your forging income from leasing:
https://nxtforum.org/leasing-pools/nxtcrypto-org-leased-forging-pool-only-fees-are-1nxt-to-withdraw/
and there's a couple of others, but I'm too lazy to search. Off to my bed......
It's really cool, if NXT comes mainstream , forging can serve as a interest bearing deposit account