Yes that would be wonderful. This request has been brought up before. Unfortunately that is currently the price of virtualisation. The current virtual mouse driver doesn't have this feature in it.
Since you are talking about an external mouse, you could still connect your mouse directly to the USB port on the guest.
In that case you should be able to use this feature in your guest.
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I can't see how to connect my physical mouse to the VM. Fusion doesn't seem to provide that option, and even if it did, returning the mouse to the host would be cumbersome.
In any case, let's hope the VMware developers manage to emulate advanced mice (such as the Logitech Performance Mouse MX) with their VMware Mouse driver.
I can't see how to connect my physical mouse to the VM. Fusion doesn't seem to provide that option,
Take a look at A Power User's Guide to VMware Fusion, about half way down the section on USB HID.
...and even if it did, returning the mouse to the host would be cumbersome.
Yes, it could be. You'd likely need two mice since once the VM has control of the mouse, you probably wouldn't be able to get to any Fusion menus to deselect the mouse. Me personally, while I don't use a dedicated mouse in the VM, I do have multiple KB & mice attached. Trackball & wired keyboard for normal work, gaming mouse and wireless kb & mouse for sitting on the couch watching movies.
Agreed, it would be nice to have emulation of the advanced mouse you have or at least be able to configure mouse actions.
Holding down the SHIFT key whilst scrolling vertically, gives you horizontal scroll in Google Chrome or Safari running in Windows guest VM.
(Note I edited the subject as there is a spelling typo, so may hamper search results).