middle mouse not possible?

[Addhead]

Hello Osc Forum people,

I hope that i'm in the right place.

I have a hard time to get middle mouse button to work normal from midi

The point is my (Logitech K400r) keyboard don't have a middle mouse button,
now i try to arrange it by Osculator.

I hit a midi note, then i use trigger input, and use event type Mouse,
Value middle mouse.

If i than go to Davinci resolve, i klik on that midi note,
but no middle mouse klik is seeing there.

It looks more like a right button click.
Do i some things wrong?

Or is it maybe possible to reassign a key from this keyboard to use as a middle mouse button?

Thanks, Peter