The program does seem to work that way for me to . If you right click on the message bodies , there is a nice little set of delete thingies (delete bodies [shift+del] delete headers [alt+x] ) right in the middle of the page .
The problem for me is my left hand (infeydal) is permanently attached to the mouse

so typing is slow and short cut keys are limited to one finger .
Hope this helps
Ps : I use this method to edit the lists a lot . Deleteing things in large groups like messages that are under 100 lines and before a certain date .
Just old habits witch are hard to break and the inability to understand filters very well .
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