There are worse things to have all over the place from what I can tell.
We've been running tests there, but mostly she's just curious and friendly with them.No problems to report. Sounds a lot like Theta and EDI perform a lot of the same functions so, unless there's some comparability problem on the technical side of things, I doubt very much there would be any kind of problem. We can introduce them and see how it goes? and that's a growing number here.
Any and all of the above, though, being fair, the Normandy's current pilot is always going to be top pick for that chair. The M-Ships are the probably the easiest to train people in, given the copilot can take over the controls at any given time and they're the things we have the most of on hand. So far, we're limited on Shuttle pilots and the RIV could always use people who understand more of her systems, but we try and keep her pretty close to the space station too -- so less room to stretch your wings when we get out there.