I would have totally used this as I had the same issue as well and tried multiple different apps before settling in to BetterTouchTool to basically cover all th

I would have totally used this as I had the same issue as well and tried multiple different apps before settling in to BetterTouchTool to basically cover all the shortcuts and much more. I got in back when it was in Beta and still paid for it afterwards, because of continued support/development. The other thing to think about if you make this a paid app is the price point and utility. The one thing I dislike about a lot of Mac Apps like this, which provide some simple functionality, end up discontinuing development if there isn't much revenue or if the developer gets busy. So when the OS updates or something breaks or it doesn't work with a new model/hardware changes (Ex: Touchbar), there's no support or updates. (This is something that I factor in, looking at what other things the developer has done or supported in the past, based on the price point for the app ($1 vs $10 etc)