Under "My Hub" when you receive a System message it is often triggered by a particular user. It'd be nice to be able to just click that username and be able to send them a message. Right now you just get the username in plain text. For example:

TOOL: My New Tool
SUMMARY:
WHEN 13 Oct, 2008
BY: johndoe
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MESSAGE:
I would suggest putting the *.dat files in the data directory. Then no copy is required.
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It'd be nice in this case to be able to reply to johndoe just by clicking on his username. I'd imagine this functionality would also be useful in other types of "My Hub" messages.