Anyhow, thinking about it, I don't think pressing enter to open a selected block's detailed editing menu is that much of a big deal on a unit limited to 4 blocks. In fact, at least on the HX Stomp, I'd rather have solid encoders (with maybe just the two bigger general encoders being clickable) rather than living in constant fear of them breaking. They don't serve any often used operation anyway.
I think with the VP4 quick permanent (at least in one mode) parameter access would improve usability much, much more than clickable knobs. If you want detailed editing, just press enter or use the page keys for the next set of parameters.