I would like to see an new operator that could take as input an Boundary (IMAGINE.Boundary) and output Features (IMAGINE.Features).
That would allow a boundary from (say) an raster image to be available as a feature that can be used for feature analysis. e.g. filter feature by the raster boundary.
example concept (Mock up of an 'Boundary to Features' operator and how it could be used):
(An alternative approach would be to introduce a new Functional Attribute Expression such as 'CREATEPOINT(X,Y,Z,CRS)'. Could then take the Boundary and extract MinX, MaxX, MinY, MaxY as input to Create Point expression. That could then feed into existing functional attribute CREATEPOLYGON expression which I suspect would give Boundary To Features equiv)