Query about fermata

I know that MS is for setting out music and it's brilliant.
My current task is setting out pieces for a male voice choir using books printed in the early 50s as my source. I have a template (using 2 staves and the correct clefs )so they all look alike, are very clear and legible (unlike the originals) and the current singers like them.
However, not all the singers read music particularly well and so I create practice discs using MS and its sound fonts. because I can only have 1 "sound" per stave (would be excellent to have a different sound for each voice in each stave eventually), I split each part out to a separate stave, give a "strong" sound to the voice I want to emphasis and a "less strong" voice to the other 3 parts and piano.
It works, people learn their voice and can still hear how it sounds with the other 3 voices.
Now my problem...
Our music often has a Fermata on notes at the end of a phrase where the conductor will pause.
Just using MS playback doesn't pause at all.
Question. Is it possible to introduce a pause for each fermata? If so, How do I do it? Or do I just continue as I do at the moment, showing the fermata in the printed music but not having it in the playback.

Then I read the book and it talks about "Time-stretch" but I can't see where that is shown in inspector for the note(s) to which the fermata applies.
Can some-one point me in the right direction?