I'm happy with the current copy and paste, but I have one complaint.

When I'm done copying and going on to paste, I often have to click/highlight something else in order to paste what I'm going to paste. Then the copied material disappears from the buffer. This is the same problem as Four is talking about. For this reason I also chose that I would like it to be configurable, but I think there's a far simpler solution, especially since figuring out how to configure something can be a pain in the butt. I would really like to see COPIED MATERIAL STORED IN A STACK so that you could do something like the following.

1) Copy a URL from some random location.
2) Highlight the browser URL window (or whatever you call that window at the top where you enter URLs) without deleting from the buffer what it is that you just copied.
3) Go back through the stack and paste what you copied originally.

I don't know how many times I've done this or something similar and then at step 2 or 3 realized that I had to go back and copy all over again because step 2 deleted what I wanted to paste.

Also, sometimes all you have to do is just click your mouse somewhere and what you pasted will be deleted from the buffer. For example if you're entering information on a form, sometimes you have to click into a particular field to bring focus of the cursor to that field. Or maybe you just click your mouse onto a window to bring focus to the window that you want to paste into (I use alt-tab to avoid that but it can become inconvenient to have to rely on something like that). Usually for me it involves highlighting something in order to delete it so that something else can be pasted in its place.

I think if this were changed (it seems to me it shouldn't be complicated unless I'm missing something), it would be a big improvement and many people's complaints should go away. I know my complaints would go away. I think this could be changed by using a copy-paste stack as I suggested above (like emacs's kill ring).

I love the flexibility of having two clipboards in *nix. I used to hate it back when I first started using Linux, but it quickly grew on me and now when I have to use Windows I get frustrated by the lack of the selection clipboard. You don't realize how convenient it is until you have to work on Windows.

Linux copy & paste is fine as is.