Yes, TextBlade supports the ESC key, and all other functions on a standard PC or Mac keyboard. This was a point that was strongly advocated by the software engineers on our development team as we designed TextBlade.
Our new MultiMap software also lets you customize the access to those functions too, including the ESC key. Many IT customers have already pinged us about this topic, so we know how important it is for our users. We'll be publishing more media about how users access these features in our MultiMap info section next month.