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I would suggest it would be much more secure if Linode were to allow us to create a special "linode support" user and install their SSH key under that user. This would mean we wouldn't have to enable remote root access to our servers and any access would be properly audited to an identifiable user (which is particularly important if anyone is doing anything that touches the world of PCIDSS or other related standards).
Just an update - this has been implemented. You're able to specify both a user and a port that we can log in with, we just ask that you note these things in the provided fields and make sure we can sudo!