I just wanted to take a second to compliment CST on their first class customer service. I just got a CST 1350, and like it pretty well with one exception, the middle button is set as a "drag lock" or, if you hold it for 3 seconds, it changes modes to a "scroll lock". This means that there is no middle click option, and default function of the middle button is to click and hold for easy dragging without holding the mouse button, or scrolling (if you're patient enough to wait 3 seconds for the mode to change each time you need to scroll). I have very little use for either function, so I tried using software tricks, but nothing worked because no mouse button remapping software expects either of those functions as a default button command to intercept and replace with your remapped instruction. I then opened the case to look for a dip switch or jumper with no luck.
I finally decided to email them from their online support form, and quickly received a response that there WAS a fix, but it required soldering, and if I was interested the employee would email it to me. I was curious about how in depth the fix would be, and willing to give it a shot if it was straightforward. He emailed me back a pdf with a nice shot of a single jumper on the PCB and instructions of where to solder in the jumper to convert the device to a |true 3 button" trackball. He also included in the email a reminder not to overtighten the case screws when closing the case back because it can easily strip the plastic.
Wow, what company does that? I've never contacted a single consumer-level company that will send you a schematic for a modification along with tips for best results. Any other company would give you some brush off line like "that option is currently not shipping for the model you purchased" and leave it at that. CST just won my support for life. Once modified, the trackball will likely replace my long-thought-irreplaceable CH DT225 (no knocks against it, it's still a damn good trackball, but a bit more cumbersome, and well suited for my kids on their game computer).
This kind of experience makes me want to spread the word about CST, and make sure that others looking for a high quality trackball with great manufacturer backing consider CST before any other options. Their products are slightly more expensive at full retail than say a Kensington, Logitech, or MS trackball, but the quality of products and service makes it worth every penny.
For the record, I have no affiliation with CST or any other peripherals manufacturer or retailer. I'm just a very impressed consumer that wants to return the favor to a company that treated me well!