It's awkward to be mousing through the list of messages on the left and have to move all the way to the right top to hit the delete button or hit the keyboard delete.
There is already a "flag" button when you hover over a message in the list, please consider adding a delete button here. Outlook has this and it makes it easy via mouse to move through and delete messages.
(edit: hotmail has it too).
outlook image, hotmail image and roundcube image all attached.
Tom
This is coming to the Elastic skin (the current default) in the next version (1.7). Example attached.