As requested, in the next patch (1.61) :
- to restrict a module to more than one race:
restricted = "empire,alliance"
(any number of races, comma separated)
- to prevent an entire race using any vanilla tech, add this line to a race’s config file:
allow_default_tech = 0
- to prevent a hull from being available to the player in the Ship Design screen, add this line to the hull’s file:
available_to_player = 0