It was talked about before, that it would be nice to have some sort of touch pad capability. The problem being that, with the textblade, there really isn’t much room vertically (space bar) to do the job.
But maybe it could be better than nothing, in a pinch. Especially if it could adjust based on how fast your finger moved, with a quick vertical movement moving it pretty far. Even if you had so slide your finger more than once to get where you want to be, that may be better than having nothing.
Another possibility would be a new pnoduct. For example, it might be something you can stack together, just like the three parts of the TextBlade are stacked for portability, except this would be like having three spaceblade shaped objects which magnetically lock together to form a larger block. Yeah, there would be the issue of smoothly moving across the boundary between pieces, but I think they could be designed to fit together with no serious gap and software could probably handle most of any other issues as you cross these boundaries.
Or we could go more minimalist. Such as taking something the size of an existing space blade, but cut in half. Thus, when stuck together, you would roughly get a square but with less vertical and horizontal space than what I described above.
I could easily see something like this placed above, below, or next to my textblade and it would eliminate the need to have a mouse handy.
Of course, last I checked, you couldn’t use a mouse, so I assume the same goes for a track pad, in iOS. But maybe on the TextBlade itself there could be some alternatives, depending on what Apple allows. Maybe just a way to move the focus on app screens to select an app or folder or move to another page and then select something. Wouldn’t cover use in applications, but would still be useful.