One feature that I would find convenient is:
1) I'm typing IDEtalk message
2) I want to mention some class (from current project or libraries) in this message
3) I type CamelCase pattern and invoke regular Ctrl-Alt-Space: "PERR" -> "com.intellij.psi.PsiElementResolveResult"
Of course I can send a 'code pointer' but this feature would provide much more natural flow I think.