[Form] Change place (order) of hidden fields

Hi, 
since it doesnt work with twitters bootstrap to have hidden fields rendered as first fields it would be nice to render them as last fields.
is there any way to change that behaviour? 
see https://github.com/phiamo/MopaBootstrapBundle/issues/48 to read more about the problem.
Just rendering them either in order of adding or as last fields would be sufficient
Cheers Phil
