There isn't a way using the PS Live Filter. They're primarily there to maintain the edibility of PS Layer Styles, in case the file goes back to PS. What are you trying to achieve? Fireworks native gradient tools are pretty robust.
I'm trying to apply a gradient stroke without resorting to outlining the path I'm working with... but apart of that, WTF? You guys put in a feature that works only 50% to keep stuff compatible? Really? What kind of product management do you guys have over there? C'mon!
Fireworks is driving me crazy, stuff that is supposed to be 27 pixels looks out of sync, and even snapping to pixel doesn't do the magic most of the time.
not to mention the hilarious decision of somebody to make the autoshape dialog NOT pick up the Uber-common CTRL-A shortcut, so when I'm trying to select all the content in one of the inputs, selects all my artwork instead.
I have more, are you interested?
The outline effects in Photoshop is one of the few reasons I'll use photoshop. I find Fireworks to be a very simple yet powerful tool with non-destructive editing and effects. Sorry there is no answer to your question (or solution for that matter). If you can get a cheap copy of Fireworks 8, it has some really neat effects from Alien Skin.
I do understand your frustration.
You can let Adobe know how you feel by wallet management.
you can edit it in PS, then open the same PSD file in FW, and it's done. a little hassle but still fairly quick.
Through my frustration, I came across this same problem... the solution, though, was avoiding putting gradient on a stroke. I needed to make a nice little checkbox, so I made one square shape, put a smaller one in front of it, selected them both, and used the combine tools in the properties bar off to the far right. It will make them into one shape and you can use all of the fill effects instead of the limited stroke effects. Hope this helps!