For your 'limit' validator you could go pass in the limit value directly to 
your custom validator:

<my:validateLimit limit="#{backingBean.limit}" />

 - again how it works with dataTable I'm not sure.

The trouble with the inbuilt:

<f:validateLongRange minimum="0" maximum="#{backingBean.limit}"  />

is that (with MyFaces at least) is that the attributes of the f:validate* tags 
is afaik they don't accept EL.

This doesn't address your more general requirement of passing other attributes 
to a validator; but is it a 'better' way to do it? I don't know.

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