Pega Constellation - pxSubmitMode - Property

​Hi All, anyone have idea on pxSubmitMode OOTB property.?

we observed that Save for Later" triggers the Pre-Processing configured activities and data transforms and would like conditionalize these pre action with suitable parameters.

do we have any OOTB actions/properties to record the buttons interactions.

is there any property like pxSubmitMode ?. but unable to find it on pyWorkPage . any additional configuration required?