Old thread, but in case anyone else finds this, there is a trick for USB. Basically USB 3.0 interferes with RF used for the connection. You don't need a USB extension cable to get the receiver closer to the keyboard, you just need a USB extension cable to get the receiver a little bit further from the USB 3.0 port, or use a USB 2.0 port if available. The Kinesis Advantage is the best ergonomic keyboard I've found. I've been using them for many years. I definitely think it's worth the extra money over the freestyle and other 'ergonomic' keyboards like Microsoft's and Logitech's offerings. They are, however, very expensive.
I'm very interested in any replies to Cliff's question. I've reached the point where the motion of reaching over to move the mouse with my right hand causes excruciating pain in my arm. Talk about repetitive motion injuries; I've been using a mouse since they first came out - when - 1980? and I guess I'm about moused out. For now, I've switched the mouse over to the left side, but as I'm right-handed, it's awkward at best. I have an old Adesso ergonomic keyboard with a touchpad at the bottom that I got about 4 years ago for my Windows-based computer. It solved the problem perfectly. If I get adapter cables to convert the six-pin cables to USB, will I be able to use it? Adesso apparently makes a Mac-compatible ergonomic keyboard but I can't find it to buy it. If I download their Mac driver, do you think it would work? Any other ideas for an ergonomically designed keyboard with a centered touchpad would be appreciated. Kathryn Z
Mac Stickers For Microsoft Ergonomic Keyboard Free