I'm not an expert, but ENG is the native token of Steem-engine, like Steem is the native token on SteemIt.
I have a couple (not much), just in case. But i don't know enough about it to give you advice on that.
The second question, however... as it happens, I bumped into a post today which I read earlier this week but totally forgot about.
There's a service that claims your tokens automatically every hour. The staking, I'm afraid, is a manual process, but automating the claiming process will save you a lot of time.
Here's a link to the post about it: https://steemit.com/kr/@blockchainstudio/scotauto
