xsi5 : Replacing weight values

Can I transfer the weight values on one deformer to a new one, basically swapping one out for another? The slider thingy in the weight editor won't really let you just select the old and new deformers and transfer the current values over, it just lets you set up a relative distributution that completely ignores the actual values as well as values on any other deformers. It seems only to preserve the proportions. Thanks in advance for any help.