Well, since you say your app is now working, I'd say you did. :) As for your question about whether other apps now can't use Wine's msvcrt, that depends on how you set the override. If you set it for the default settings, then all other apps installed to that wineprefix will use the native msvcrt unless you change them individually. If you just set the override for this app (i.e., added it to the Applications tab, and had it selected when you went to the Libraries tab), then msvcrt will be overridden only for this app. About the mouse, that I don't know.
