Add options in Base Changes window to only show the diff between Left+Base and Base+Right

When doing a complex merge using the conflict Solver I often use the Base Changes window to see what has changed between since the common parent in both cases which is a fantastic feature, thanks! When using the "Left+Base" mode the Base view still shows the changes compared to Right, even though it is hidden (and same when using Right+Base - the changes between Right and Base are still shown in the Base View).

Would it be possible to add an option (e.g. toolbar button or menu option) to toggle this behaviour to only show the diff between the relevant side and Base. This would then give the same effect as selecting the Base commit and whichever commit corresponds to Left or Right in the log window (which is the workaround I currently use).

Below is an example from an opensource project that (hopefully) illustrates what I mean.

Base Changes Window:

Base + Right selected

The changes shown for lines 45 to 56 in the Common Base above are the changes between Left and Base (which is what I would like to temporarily turn off). 

For reference, selecting the same two commits in the the log view and using the File Compare Tool shows the following:

And just in case you would also like to see it, this is the view for Left + Base:

and its associated File Compare (Base is on left in this view)