Yes, this can be done within KHP 4.103.
Edit menu > Settings... > Title Page
Change the Display For: field entry to how long you want the Title page to display before the music starts. If it is longer than any silence at the start of the music, extra silence will be added. When you export the CDG file, the silent samples are added to the start of the file.
Let me know if this doesn't work as I describe.