We don't see a lot of alternations being done to the echo. I want to say outside of it being copied we don't have any other hints as to what can be done to someone's echo ability. For instance do you think someone could alter it to be triggered more often? Like how Fordola's resonant is shown to be triggered more often. Or could it be manipulated to pick up memories more often from a certain person or type of area? I know Misija used her resonant as sort of a spy weapon due to hers being a copy of Mikoto's future sight. Like maybe it got altered to trigger more often at battle sites. Or around the WoL in an unknown to the person is being used as a spy kind of way.