Is there any reason why you can't manually specify a speech animation for mechanim-based players/NPCs the same way you can for legacy-based characters?
The whole point of the Legacy integration is that it's able to make a whole lot of assumptions about your character, so that it will "take care" of most things while you just supply what it needs. With Mecanim, that's not the case - there are multiple layers, parameters, and so on that don't make a simple "Speech animation" field in the speech Action feasible.
If you know what you need out of such a field that caters to your own game, don't forget that you can duplicate the speech Action and use a custom one instead.
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If you know what you need out of such a field that caters to your own game, don't forget that you can duplicate the speech Action and use a custom one instead.