Re: how do I silence the "space" bar?
The first thing that springs to mind is using one of the speech dictionaries, presuming you have letters being pronounced, and substitute the space character with no replacement.
Since you mention "many applications" that implies "not all." You may want to use application profiles as part of this, but I'm not quite clear at the moment how that would be tied in with dictionaries, which I believe are independent of the application profile being used, but I could be wrong.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
Science has become just another voice in the room; it has lost its platform. Now, you simply declare your own truth.
~ Dr. Paul A. Offit, in New York Times article, How Anti-Vaccine Sentiment Took Hold in the United States, September 23, 2019