Following Roberts rules strictly is impossible. An ad hoc voting system based on Roberts rules is possible, but the issues of debating over email must be addressed. If the goal is to get a voting system into an online debate, then the PAB rules for debate and voting are pretty well thought out. But that requires a certain amount of self-organization to take place, and should be the topic of another forum. The nature of online discussion require human moderation, even more so than with face to face discussion.
Online votes take far more time than a show of hands.
When you add the fact that we really have global representation, you have to allow at least a few days for a vote. Therefore, you must have some way to limit the number of votes taken. At the simplest level, votes are an information gathering mechanism. The Chair may attempt to determine a consensus concerning a given issue by announcing a Call for Consensus to the WG list. After a reasonable period of debate, generally not less than one week and not more than one month, the Chair shall announce either that a preliminary consensus has been reached or that it has not been reached.