I was already aware of each button's capabilities as is evident with a quick look through the documentation. What was never explained was that this was the cause of the latency, although I have since figured that was the case. Your response seems to confirm this so thank you.
More so, I was asking specifically if anyone had a solution, which I have just found and will post for anyone stumbling across this later.
As I don't have any use the 'Hold' or 'Released' functions for any automation or app, it seems you can forego that function in exchange for latency-free button 'Presses' by installing and swapping each dimmer's driver with Keo's driver 'Hue Dimmer Button Controller' as found here:
To make it work I had to remove line 19.
This seems to be a more rudimentary DIY driver before the implementation of the official Hubitat one. It's missing the 'Hold' and 'Released' functions, although they do show and I'm sure a quick bit of tinkering in the code buy someone much more computer-literate than myself could remedy that no problem. The upside though seems to be that now all buttons (including 2 & 3) respond immediately without latency. A small niggle sure, but I know I'm definitely not the only one who this bothers (especially when repurposing the dimmer to control time-sensitive functions, such as scrubbing through media or stopping a moving blind for example).
Hope this helps someone. Happy pressing!
