Not sure to be honest Paschoal - as I say, I've not had to tinker with Serialization so I don't have personal experience there - I only mentioned it as I remembered it being mentioned elsewhere in the forums and assumed that the EntitySpaces code was implementing some sort of custom serialization when using the proxies (as it doesn't always output everything - i.e. dirty columns only, entity state if needed etc).
I suppose it depends on where (and if) this customised serialization is taking place - if it's in generated code then you can naturally override/alter that, if it's in the base classes though then that's obviously different.
Hopefully one of the ES guys will chip in to confirm.
Just in case the code isn't accessible though you may want to take a look at the two articles I've pointed to (if you haven't already) as implementing your own custom serialization methods doesn't look too complex.
Hope that helps - at least until one of the ES guys answers anyway
Thanks
Martin