If a vendor doesn't support a design or let's say a type of implementation, you are steering into a cliff. What you have to think about is how will Spectralink support help you or the customer if the design guide was not followed. No other options means you will be winging it and trying to find a way to make it a little better with no support from the manufacturer.
I don't know how you can make roaming better since roaming is determined from the device itself, which is the Spectralink phone. First thing I would do is test with central switching just to get a baseline and make sure that with their design requirements, everything is working fine. This way you have a baseline and can go from there. If your roaming times are the same, well.... that tells you that you have to look elsewhere to figure out the issue. Can be software issue on the phone or possibly ap density and or locations.
You at least can follow the instructions that Spectrlink has on features they want enabled on the wlan and what they want disable.
-Scott
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