Select (mark) all/none also in target panel

[StatusQuo]

Situation: After comparing directory contents with Shift+F2, files in both panels are selected.
Problem: To now compare two single files left/right (cm_CompareFilesByContent) I have to unselect the other files in both panels separately
(pressing 4 key combinations: Ctrl+NumSub, TAB, Ctrl+NumSub, TAB).

Suggestion: Additional commands to work on both sides (so the user can map them to single keys) to (Un)SelectAll:

• cm_ClearAllSrcTrg
  cm_ClearAllCfgSrcTrg
  cm_SelectAllSrcTrg
  cm_SelectAllBothSrcTrg

For the meantime I wrote a small AHK solution for this,
using (Shift+)Ctrl+Alt+NumAdd / NumSub.