DynamicSetting[e] represents an object which displays as e, but is interpreted as the dynamically updated current value of Setting[e] if supplied as Mathematica input.
DynamicSetting[f, e] displays as , but is interpreted as if supplied as input.
DynamicSetting[e] returns an object which remains unchanged until it is explicitly supplied as Mathematica input, and evaluated using Shift+Enter, Evaluate in Place, etc.
In the object returned by DynamicSetting all controls such as sliders are operable.