Right now community content is essentially limited to foundry, but i feel like if they opened up some more of their tools, players would quickly take to creating ship skins, components and maybe entirely new hull designs.
Not possible. Besides the copyright & trademark issues with letting people add Cylon raiders and Firefly ships, ship sales are what keep the servers running and salaries paid.
If they allowed custom ships, whales would not buy every new ship and the game would shut down.
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KDF: Dahar Master Kan (Borg Klingon Tactical)::Dahar Master Torc (Alien Science)::Dahar Master Sisteric (Gorn Engineer)
RR-Fed: Citizen Sirroc (Romulan Science)::Fleet Admiral Grell (Alien Engineer)
RR-KDF: Fleet Admiral Zemo (Reman Tactical)::Fleet Admiral Xinatek (Reman Science)::Fleet Admiral Bel (Alien Engineer)
TOS-Fed: Fleet Admiral Katem (Andorian Tactical)::Lieutenant Commander Straad (Vulcan Engineer)
Dom-Fed: Dan'Tar (Jem'Hadar Science)
Dom-KDF: Kamtana'Solan (Jem'Hadar Science)
CoHost of Tribbles in Ecstasy (Zombee)
If they allowed custom ships, whales would not buy every new ship and the game would shut down.