Lets the user attach webcam images to comments
Yes. You can change some settings in camcomment.php. It is also possible to change the text of the button.
Yes, you can change the size in camcomment.php. Make sure that the proportions stay the same (width/height ratio).
No, not at this moment.
Tell them to right click the webcam window and go to Settings. In here they should be able to find their cam.
Make sure that you've enabled Avatars. Also make sure that the plugin directory contains the subdirectory "camcommentimages", and that subdirectory contains the subdirectory "thumbs".
Just edit the images in the "graphics" directory.