You mean your 'inside notedeck micro app' app idea where they are listed in the sidebar?
Personally i would not mind it being seperate apps, probably prefer it. But dont listen to me in this regard...i am a barbarian that still uses winamp
Discussion
Would just be weird to have a dm button and a mail button on the toolbar. I think it would make sense if there was just a conversations app where you can have one on one convos in a linear DM view, with another tab for inbox, which is just your typical email inbox with to/cc/etc