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I've essentially merged your ssh-agent bits with mine that I've been using for quite some time (http://markembling.info/2009/09/ssh-agent-in-powershell) - this provides a couple of functions for adding additional keys to the agent and stopping the agent (Add-SshKey, Stop-SshAgent). I hope I'm using the best bits of both, as you did some things better than I did originally.
The previous behaviour (start & then automatically add key) is retained. Users who wish to add more keys on a permanent basis can simply add a call to Add-SshKey <whatever/key/file> to their profile after the Start-SshAgent call.
I hope you like :)