Restaurants that are fast paced want to avoid modifiers being automatically on to reduce time. However, when a customer has an allergy or request, it requires each item to be selected to have modifier added such as "no msg". It would be helpful to be able to enter entire order, then select items that all require a modifier, and apply that modifier to those items at one time rather than individually.

That's easy- just go to your dashboard, select Inventory, modifier groups and tap on "Change Layout". Then you can arrange the order. It takes getting used to if you have a ton of modifier groups but it's super helpful when you want to put order to the modifier group chaos.
Also, please support this related request qbout sub modifiers: https://clover.uservoice.com/forums/946357-management-functions/suggestions/36021394-sub-modifiers