It might be useful to ignore a single bot (or more) and not all. For example, MsnBot makes a lot of minor changes and my list is full of these changes, while they are not risky, so it's harder to track changes from other bots. (source)
However, ignore people would be done through T167224, a feature that would allow people to watch what people do. This feature is paused, waiting for investigations to avoid harassement.