1. It limits the amount of connections you can make to other clients. Not perse the download speed.

2. It's there in 1.11

3. The underline is to get a better overview what columns match the file (sometimes you can skip to the wrong line when looking at another column). Don't see why a single click should start the download. May work more confusing I think.

4. Uhm.. Go to the Files tab and double click the file (or rightclick, sorry can't check right now)

5. Pasman?

For the update to be activated. You'll need to quit XoloX (also from the tray) and restart it.