Two cvars (set in both ConfigureShard() and ConfigureLobbyServer()): one for regular ships, one for premium/DLC ships. Default 3 regular, 2 premium (premium/DLC ships may mount 1 of each experimental module). 

-- Limit of identical unique modules per ship (balance rule).
cvars.store_maxUniqueModules = 3
-- Limit on premium ships; allows experimental modules on premium and DLC ships.
cvars.store_maxUniqueModulesOnPremium = 2
Raise both (e.g. 6 and 4) for silly experimental builds, or set to 1 for strict balance. Change in both functions.
Additional Notes: 
Set in ConfigureShard and ConfigureLobbyServer.

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3 + 11 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.