One use of the Holodecks that I think would be really cool to see is something where you can create a customizable scenario mission, which increases your Holoprograming skill, this of course would be a series of menu options such.
In addition one of the worse things about having server down time or maybe even your inability to play they game due to lack of internet connection at the time is the idea that if your not online you cant play the game. What if a client side program was created that would allow you to create custom events like you see in the Holodeck. with that said you can have a layered system of customization built into it that would allow a type of Wizard design process for the individuals that really dont have a lot of time to spend in designing holodeck environments and on the flip side you can allow access for the more crazed Modders out there to create Holo novels for the community. We know the system works and this would ensure the life expectancy of STO for years to come, shoot look at BC, long after support has ceased from the developer we still see new content being released.
Space or Ground
*Ground* (denotes user input)
Cave, Small Town, Large Town, Forest, ect....
*Cave*
Small Cave, Large Cave
*Small Cave*
Opposition, Scientific Study, Capture the Flag, etc......
*Opposition*
Number of Enemy forces
*100*
AI Level
Beginner, Intermediate, advanced
*Intermediate*
Enemy Species
Klingon, Romulan, Borg, Random
*Random*
Computer*** Simulation created enter when ready!
I think something like that would be very awesome plus the options for customizing different mission would be highly variable and allow anyone to create and maybe share there "No Win Scenario's " with everyone else within there guild.