using tiles/validator across modules

how can I configure my struts-config files to allow modules to define the validation rules and tiles definitions they (and only they) need, while defining cross application validations/tile-defs at the default struts config level? Currently, we do NOT use the default struts config. It is defined

using modules with JSPs behind WEB-INF

I'm using struts 1.2.9 which the struts site claims is the "prime time" ready version. I would like to use modules and put my JSPs behind WEB-INF to protect them. When I try this with struts, it rewrites my URL with the module name and causes 404 errors on validation failures. I read all over th