Hi,
Removing that check seems like a fine solution if you had something working well and want to revert to the old functionality. We primarily inted bUseMouseForTouch to be used for testing touch controls on PC, so disabling mouse move events while the mouse wasn’t held brought it more inline with what you’d see on a mobile device. Scrollboxes do support right click scrolling by default, so the other option would be to modify that to also accept left click.
Best,
Cody