Cursor into OK code field: We have created our own menu screen that replaces the SAP main menu. Since there are input fields on the screen the cursor is automatically placed on the first entry field. Is there a way to put the cursor in to the OK code field instead? Our users often do not use the menu functions but enter a transaction code directly.

No, it isn't possible to change this SAP GUI standard in GuiXT. Try the following approach: Start without inputfields and add a pushbutton that allows the user to display additional menu parts that contain input fields.