Yes it's more convenient to be able to adjust these settings in-game. This plugin was lost somewhere in the cover thread.
I was pretty excited to see Blade Runner running too. Some little grafx issues, maybe not completable yet but it's still very good news!
About ustealth, I can't help. I don't have a Wii-U and I hate compiling stuff without testing.
I've only wrote virtual keyboard's code for hatari and dragon/coco. Both are using SDL, that's not really useful for WiiFlow.
For Wiituka it's GRRRlib.
Usbloader-gx is using libwiigui for the keyboard. Not sure it's a viable solution either. And writing such a thing in GX directly or even with Wiiflow drawing functions doesn't seem easy right?
I agree that's a very useful feature lacking, that'd be great to search for a media in large libraries...