I, uh, actually kind of like the idea. If you just visually converted primitives to a toggle after you type true/false, and let you delete it like any other text, it could be a small convenience on any flags you might change during the development process.
Oh, I could easily see a trainwreck of an implementation. But if this was just a display option like color coding keywords and variables, but you could click to change the underlying true/false? I might add it.