I am a long-time MX Master 3s user and I absolutely love the flexibility of Logi Options+.
However, there is one game-changing feature missing: the ability to assign modifier-based layers to mouse buttons, similar to what SteerMouse already offers.

Imagine this: every button on the MX Master can perform one action normally. But when combined with modifiers (⌘ Command, ⇧ Shift, ⌥ Option, ^ Control), the number of possibilities explodes exponentially.
• With no modifier → 1× actions
• With Command → 2× actions
• With Shift + Command → 4× actions
• With Ctrl + Shift + Command + Option → up to 16× actions on the very same button!

This means a single MX Master could literally give us 16 times more functions without adding any new hardware. For creative professionals (like video editors in Adobe Premiere Pro), this is massive. It would put Logi Options+ miles ahead of every other customization tool on macOS and Windows.

Please consider adding this feature — it would unleash the true potential of the MX Master series and make Options+ not just good, but legendary.