Hi @Stéphane Thank you very much for the feedback!
Professional media content creators, the only clients for this app, work almost exclusively with robust workstations and never ever put the machine to sleep, most media creators leave the machine on 24/7 some shut down at nights and some only shut down during weekends.
In fact as part of 'Media work optimisation' many of them even go step further and remove hibernation completely from their systems to make the machine more efficient and light.
In light of this I don't expect this feature to be much in use, if ever, but still I give the option even if for rare cases.
It works and I can leave it as is, but it bothers me I don't know how to delay the shut down event under OS X to make it 'slicker'