[Springtime]

I wonder if any of these DIY Blackberry keyboard products (or BB-like such as that recent Clicks case) have the capacitive touchpad feature that later Blackberry had, where you could use the surface of the keyboard itself as a touchpad for scrolling, tapping (without depressing any key), text selection, etc.

[zenkalia]

Not that I've seen. The Lilygo and BBQ20 keyboards all seem to use surplus Arabic BB keyboards that are made to be used with the little trackpad thing like on the tdeck.