... is really cool and useful, helps you get things typed even faster than before, and was just added in v2.35, released today.
The way it works is, when Breevy finds an %(Input) in the replacement text of an abbreviation, it will pause -- right in the middle of outputting the replacement text -- and wait for your input. After you're done typing your input, you can press the Tab key and Breevy will continue with the rest of the output.
For example, if you have a replacement text of Hello, my name is %(Input) and I live in %(Input)., Breevy would first output Hello, my name is (after you type the abbreviation associated with the replacement text, of course) and then it would wait for your input. Of course, in this case you would enter your name.
Then you'd press Tab to tell Breevy you're done. Breevy would then continue "typing" the rest of the replacement text until the next %(Input): and I live in. Once again it would pause and wait for your input... this time, you would want to enter your location. Press Tab again and Breevy continues with the output... in this case, just a period.
You can also optionally add identifiers to the %(Input) macro. For example, if you do something like %(Input e-mail address), Breevy would first output e-mail address, automatically select / highlight it, and then pause, allowing you to type your e-mail address (no need for you to manually delete the phrase e-mail address since if you type a key while text is highlighted, the highlighted text is removed).
The benefit to using identifiers in the %(Input) macro is, while they're not necessary, they make it easier to quickly remember what you're supposed to type at a certain point in the replacement text.
You can download Breevy here and try out the new macro for yourself.