not sure about this one… feels like it will be cumbersome. the reason i say this is because it reminds me of the way to input strings with hardware that doesn’t have a dedicated keyboard, say like naming projects on elektron gear (doing a search on my bluray player is also similar and i find i avoid using it for this very reason). grid will be worse as you’re dealing with 128 buttons vs something like 30.
the 2nd reason is that this mode is not really intended as a replacement for grid input, but rather as a way to test grid scenes. in this case you probably won’t need to test pressing specific coordinates as much as specific controls (say, you want to test that pressing button 5 does what it’s supposed to do).
another purpose is using grid scenes without a grid by programming triggers or metro script to imitate button presses, in which case a dedicated op will allow you to do this with very little scene modification. for this purpose an op for coordinates also makes sense as you could set coordinates based on IN or PARAM or TURTLE or even sequence them with pattern data.