Suppose I have a template with a channel entries tag on it. I need to execute an extension method during a hook that runs before the channel entries query takes place. It doesn't matter what parameters are passed to the hook, I just need to execute some logic any time entries are going to be queried.
It sounds like the channel_entries_row hook would do it? http://ellislab.com/expressionengine/user-guide/development/extension_hooks/module/channel/index.html#channel-entries-row
We should make a feature request. I need a hook that runs before the query is ran too. To my knowledge, such hook does not exist.