Changing IMAP separator - does it break things?

Dear Colleagues,

I am using Dovecot 2.3.4.1 with maildirs. Just found out that MacOS Mail clients cannot work with nested folders, presumably because the MacOS Mail does not understand "." as the IMAP separator.

Other clients (ThunderBird, Sylpheed, mutt) work fine.

Do you think I can change the hierarchy separator in the "inbox" namespace without breaking other clients and the mail layout on disk, losing mail etc?

I don't want to break mail for 50 people just to please one Mac Mail user. The users are advanced developers actively using mail sorting rules, nested folders etc.

My doveconf -n is here: https://termbin.com/w1wd

-- Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/