We can tackle electronic voting in two ways. First, assuming that members are present and we have electronic voting, there are many examples of how that can be done. Many jurisdictions employ it. None is perfect, but if you're talking about saving time, it can permit the taking of votes during the bells, essentially. You can vote as soon as you get to the chamber. Once you've done that, you carry on your business and pursue other activities, as opposed to the bells ringing, everyone showing up, and everyone voting at the same time. It sort of defeats the purpose. That's assuming that everyone is present.
The next part of your question has to do with members not being present but still voting. It's certainly something that can be examined. There are certain fairly deep philosophical issues surrounding that. I wouldn't want to get into it today without doing much more research on them. Parliamentary privilege comes into play. There are a lot of factors to consider with such a proposition.