It seems very strange to me that just because people will choose either 3 or 5 seconds and not use the full spectrum of possibilities offered by a customization option, you chose not to implement the option at all. As I said before, it seems a rather trivial task to implement this, so it wouldn't be a waste of time - and neither would it be a compromise, because you're implementing a feature people have almost literally been asking for - not much of a compromise about that I'd say.