SAP GUI scripting can be used in conjunction with GuiXT scripts.
The only restriction, so far as I can see from having tested the
procedure, is the following:
the GuiXT script deletes a certain element (entry field,
button,..), it is no longer known in SAP GUI scripting.
GuiXT layout changes do not affect SAP GUI scripting. If new
screen elements are added with GuiXT (pushbuttons, radiobuttons,
or - with GuiXT InputAssistant- new entry fields), they too can
be automated with SAP GUI scripting.