Since the last time I requested a feature it had already been implemented, I thought I'd go for another.
I find the Sine behaviour really useful (though badly named). What would make it extremely useful is to be able to clamp the values - this would allow much greater control over the curves.
eg. If currently I have a triangle wave with a magnitude of 10 then I would get a wave like this
/ \ / \ /
Now if I was able to clamp the same wave to 5, then I would get a wave like this:
/ \ / \
Which would be very useful.
Also on the sine behaviour, it would be great to be able to set the offset in an action.