Possible Additions?

I was wondering if it would be possible to state the number of items that will be deleted when you press the "Remove Books" option instead of "selected books". Its a minor thing but when you may have another book further down the list accidentally selected it does make a difference.

Another option I was curious about is if it would be possible to include base themes. White (default), Sepia, and Black (or Night). I know its easy to set up but for some who are easily confused by CSS it might make things a little simpler as well as provide a base example.

These are what i currently use (borrowed the colors from ibooks)

Sepia:
body {color:rgb(63,42,24) !important;
background-color:rgb(245,239,220) !important;
}

Black (Night)
body {color:rgb(153,153,153) !important;
background-color:rgb(0,0,0) !important;
}

Finally, I love the two column option for full screen reading however i dont want to have two columns if the reader is in a windowed state. Is this somehow possible to integrate or did i perhaps miss an option?

I want to take just a minute to say I'm a first time poster but long time reader and at first found the program a bit confusing with its myriad options but upon sitting down and reading I have grown to love the work and effort that has been put into calibre. Thank you for all you've done and continue to do.