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What the fuck! Is $2 an hour legal?
As part of the unwritten, social contract of dining out, paying the bill is you saying “I’m done”. One might linger and chat a bit longer, but that doesn’t mean they have time or want another drink. Just because you want to redefine this part of what a normal person thinks is going on doesn’t mean that everyone else has to think the same way you do.
Have you considered simply asking for a refill in this situation rather than steaming about their lack of ability to read your mind? >

That is what I was going to say. Use your adult words and ask for a refill. I am a bartender and if someone has paid their tab that means they are done unless they specifically say differently. It’s super easy to make eye contact with me or raise a finger and say may I have a refill please? >


Use your adult words and ask for a refill.

“Hey asshole! How about a refill?” >

Bro I’ve had someone say that exact sentence to me. I didn’t say anything, just had security remove him from the premises >

Just don't pay the bill until you are ready to leave. Paying the bill generally means that your business is done. >

Not really. It just means you aren't ordering anything new. Why not pay whenever they can bring the bill rather than start the process AFTER you are ready to go >

If someone's ability to pay their rent is dependent on the work they do before you pay the bill, they have no motivation to do any work for you after that. 
Everything a waiter does for you after you pay the bill is paid for by the restaurant at $2/hour.