Can the actions provided by the uncanny grapple mythic champion path ability be performed in addition to the other actions you can perform when maintaining a grapple or instead of? For example:
Could I maintain the grapple, move me and the grappled creature half my speed placing them in an adjacent square, then throw them?
or
Can I maintain the grapple and choose only to either move them or throw them?
As I read uncanny grapple, it is the latter option. You choose these instead of the maneuver. The wording isn't clear, but some of the maneuvers doesn't make sense in combination with others.
The great part of Uncanny Dodge, is that it is triggered on any grapple check, not just those to maintain the grapple.