just tried inputSuggestAjax - nearly-works, but get nullpointerexception when calling remote-method.
I believe it is because seam manages its objects invisible for jsf - thus the ControllerBean bean is not found by the ajax-implementation.
somewhere in the forum there is a tip from Gavin how to access seam-objects directly but I can't remember ;-)
conclusion: this needs further investigation and does not work out of the box
may be the new remoting of seam can help, but currently I don't know how ...
is there anywhere a simple example to have a look at ?