Talking to Susan is always an option and likely the best choice short of asking about something requiring technical expertise, and even then she might be able to help you troubleshoot.
In answer to Nanase’s thought bubble question, Tedd was most likely thinking “I’m not actually ever going to use this on anyone but myself, but I may as well experiment and see what I can do.” Tedd may have entertained thoughts of he and Elliot doing stuff with it, but it’s doubtful he ever though it was likely to actually happen.
As for Nanase’s attack, no, she can’t really do that. YET. Or maybe ever.