No. See the policy (including the list of available stuff) at https://confluence.atlassian.com/display/AOD/Atlassian+OnDemand+Plugin+Policy
Atlassian are working on both extending the range of plugins available and supported, and giving users more flexibility to install other plugins. But I don't know any more than that. (Although I seem to remember you can expect improvements in the spring or early summer of next year)
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