Hey Jonny,
If you go to the weight editor panel. There's a button called Enforce Limit, 
this will allow you to input a maximum number of deformer's. Hope this helps

Date: Thu, 20 Jun 2013 16:47:55 +0100
Subject: Limiting deformer weights per vertex
From: [email protected]
To: [email protected]

I'm working on a job that delivers an enveloped mesh for use with an online 
gaming engine.
There's a list of specs that need to be considered... ie polygon count, number 
of envelope deformers etc.

One of these limitations is that there can not be anymore than 4 deformer 
weights per point.  Does anyone know of a way of limiting this or a script that 
might remove all but 4 of the weights with the most influence on a point?! 
Smoothing the weights has a lovely result but could leave me with a very 
laborious task should I need to go through point by point over half the mesh 
before I mirror the weights. 

Cheers                                    

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