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Re: Common Ground?
I believe that the answer to your question is yes, you can have multiple low load components grounded through a single wire. Although I cannot find anything in the rules that states this is specifically allowed, I cannot find anything that specifically disallows it, either, which means that the general rule is "is it good engineering practice?" FIRST is pretty good about this and so long as you aren't doing something foolish or dangerous (which you aren't, here) you should get through tech just fine.
Specifically, however, for your momentary switches, I assume that you will be hooking them up to the RC's digital inputs. You may as well use servo cable to connect them, and each servo cable comes with a ground line anyways.
As for the solenoid valve, I believe the set-up you describe has been used many times.
Jason
If you want an official answer, however post a question to the Q&A. That and the rule book are the only official, take-it-to-the-bank sources of information.
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