Please allow users to quickly select multiple contacts from the audience instead of having to tick every single one.
I need to subscribe 50 people every day to a specific sequence and have to select them all one by one in the little tick box. You could introduce using the shift key for example (like in excel) to select a range of people.
Another, more complicated solution would be to be able to automate subscribing a number of people from a specific segment every day, so that it doesn't need to be done manually.