Support for basic private key files

I'd love it if I didn't have to convert my private keys to .ppk format.

Is there any way you could support standard private key blocks, ie, just a text file with...

-----BEGIN RSA PRIVATE KEY-----
MIIEoAIBAAKCAQEArKUFRPN4f00R0W+eoBHpGDk9HcKbRNVt5OzgbuWFLN5ZDdEp
..etc
57JNJOvMPADKucCaQqCLtmtIihewLZy5sPD6hexOd8aTEzGz
-----END RSA PRIVATE KEY-----

Added to TODO list.

sweet, thanks!

This issue has been added to tracker.