Is it possible on Enter event in a table to move the cursor relatively two columns left?

Yes:
GuiXT script:
if V[NewCursorPosition]
   SetCursor "&V[NewCursorPosition]"
   Set V[NewCursorPosition] ""
endif
On Enter Process="va01_skip2cols.txt"
InputScript "va01_skip2cols.txt":
Set V[NextColumn] "&V[_tabcol]"  + 2
Set V[NewCursorPosition] "cell[All Items,&V[NextColumn],&V[_tabrow]]"