#2: Oh noes!
#3: Go to Alfred Preferences -> Workflows -> + -> Templates -> Show Alfred -> Show Alfred with Selected Text, and change the shortcut when the workflow pops up.
#5: It's actually quite useful - I often remember when/where I copied things, and the app icon reminds me.
#6: Space in Alfred has other meaning. How does Alfred know whether you mean to use a keyword or preview a file?