Using MPEX Time Stretch/ Pitch Shift Algorithm in Audio Warp

The MPEX algorithms are available in the Time Stretch/ Pitch Shift menus, but only the Elastique and Standard algorithm settings are available in the Sample Editor when the Audio Warp tab is selected. Is it possible to use MPEX with the Audio Warp function?

Also, when positioning slices In an Audio Part and one uses the Close Gaps (Time Stretch) function, does it, by default, use the algorithm that is selected in the Time Stretch menu, or is one required to select the appropriate algorithm somewhere else?