Yes, you can add pairs to a profile but be careful since, at the moment, if your profile becomes unreadable, you won’t be able to use it to authorize yourself and will be locked out of your account (contact your IDP if this happens).
As for editorrs, https://github.com/jeff-zucker/solid-ide provides the Ace/Cloud9 editor that does some syntax highlighting but is not much help with RDF. Keep your eyes on What's best triple editor on the Web that suits SoLiD development? which will provide other answers to the editor question.