Accentuate flavor, yes. Roundness of flavor, no. That's chloride. pp.141-142.
In food, NaCl does make food taste more like food. In beer, I find it makes beer taste more like salt. Not a fan. I'm sure you can add it in low enough doses that it doesn't taste salty, but I guess I don't see the need. You can always add salt to your glass of beer, just like the oldtimers, if that's what you want.
If I want chloride in beer, I get it from calcium chloride since I need calcium anyway. I'd skip the sodium, personally.