Impossible to specify which buttons manipulate virtual joysticks?

Development Programming & Scripting Blueprint
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1

(UE 4.12.5. Playing the project on PC.)

Currently the left mouse button, right mouse button, and middle mouse button all can be clicked and held to manipulate the virtual joystick (touch interface).

I want to make it so only the left mouse button would manipulate it, and the right and middle mouse buttons do different things.

How might I do that?

2

I’m really surprised isn’t possible via blueprint.

3

Sorry to bump .
Could someone from Epic verify whether is impossible or not? That’d be sweet.

4

Happy New Year Bump!