You can now choose on a position whether you want to accept applications or not. Scroll down to "Advanced settings" when creating or editing your position, then choose what you prefer. If you click "Not accepting" candidates will not be able to apply for this position, but you can still send contact requests. If you change your mind, you can always go back and update it, to allow applications.

If you're already in contact with candidates who've applied to your application and have just enough on your hands already, it might be a good idea to go in here and pause applications for a while. The candidates you're working with won't go anywhere, you just get a bit more breathing room to do your work.