I've got a Logitech G403, which has a little button just behind the scroll wheel that you can program to behave as the middle button. It's not positioned very w

I've got a Logitech G403, which has a little button just behind the scroll wheel that you can program to behave as the middle button. It's not positioned very well for chording, but for middle clicks and middle drags I've found it fine. Certainly much more comfortable than any scroll wheel.