The custom fields seem to be a great feature but I can't find a good use for them while not harming the customer journey during booking process. I see double use for them in our case: we are obliged (legally) to collect more customer date for each guest staying at the property as well as would like to have more info (eg preferred languages) to custom communication. Unfortunately I can't send a request to a guest to provide more info as an online fillable forms because OwnerRez cannot prevent custom fields from showing also during quote acceptance if you want them to show during separate 'agreement signing'. (and agreement signing is the only way to try to collect them now as OwnerRez does not offer any way to create standalone fillable forms outside of the agreement signing process)
