Hi,
You are correct leave as so much paus you/producer/musician needs
You can only have one CD Track Start marker (otherwise the Hidden Track
wont be hidden !) but you could insert a CD Track Index marker
where the hidden Track begins if you like and you need the CD Track End marker !
“Hidden Track” before CD Track 1 is more common I think !?
rewind from very start of CD track 1
but ask in Mastering forum as well Bob Katz etc
regards S-EH