AFAIK If you just put allied sides as owner then all the allied sides will be able to build it, but the soviets will not ever be able to even if they capture the prequisite. If you give it an allied prequisite but only soviet owners then only the soviets will be able to build it if they capture the required structures. Using a combination of owner, prequisite and forbiddenhouses you can do very interesting things with the build trees.
The 'new construction options' bug is literally that, no matter what you build, tank, plane, infantry, building EVA, Zophia, or Yuri will keep telling you that you have new construction options. Its not such a fatal bug but it does piss you off after a short (very short) period of time.
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