My old logger plugin had the ability to log on global shortcut and/or a mouse click of a icon in the systray.
I think that there is a small issue with streams though (I need to double check) but I could have swore that I accounted for that. anyhow, I have been meaning to update it for a while now, just got sidetracked on my quicktracks plugin. I will post here whne I update it if you havent found something yet.
I should have a link somewhere on my site: http://www.crackity.com
but like I said I dont think it logs track changes if it is a stream.