Concerning a web-based implementation : OK, after some rethinking I'd say most of the features can be duplicated in JavaScript+PHP, though I'm not sure it would be easier to use (load/response times).
Possible or not, I haven't used JS for anything more that "Hello World!" scripts, so all this is way beyond my current ability. And I really don't want to throw away the Windows app (hey, months of work

)
Maybe I could just charge a one-time fee (say, $25) for the use of that program and give them X ticker "spots" on the server, with no further complications.
Oh, and spamming leads to bad karma, or so I hear