Thanks for the suggestion but unfortunately it wont work that way, If i need to move this corner (see image) keeping the line direction and planarity of the box then the "align gumball to selection isn’t usefull, it’s setting the direction at the resultant vectors and not the custom cplane or box direction.
what I’m doing it’s to move my object to be in line with the World coordinates, but this is not ideal, it’s adding an extra step on the modeling workflow, by repositioning the object every time i need to modify it.
I suggest you could have the Clayoo gumball to also follow Cplane coordinates or world coordinates (or selected objects). Similar to what the Rhino gumball does.
Custom CPlanes it’s very helpful when modeling different parts on the same file, parts that might have different orientations than the world coordinates