There is much anti-tipping sentiment in this thread, but customers have information about the quality of service that restaurant managers do not, so the ability to leave a large tip, small tip, or no tip at all should improve service on average.
The centuries-old concept of the intellectual cafe in Central Europe where you could order just a coffee and then spend two hours at the table talking with your peers, is now dying out: the proprietor wants you to drink your coffee quickly and then either order more or get out. Sometimes the business owner intentionally plays bad pop music loudly, so that it becomes uncomfortable to maintain a conversation in the long term.
Only solution would be to move to a place with lower rents, I think. Or start explicitly paying rent for your table at the cafe per unit of time, but that might be unsavory to most people.
The manager needs to control all of this. If they hire good waiters, you will enjoy good service. But you can't pick yours, and I don't think what you leave at the end is a particularly big lever for affecting the service you've already had.