Can you use the full bar rest for any time signature. If you can't, which rest would you use to cover a whole bar with a time signature of 9/4?
Yes, it works for any time sig. Think about it, if there's a rest in a bar, but no notes, it's pretty well self-explanatory.
About the only times a semibreve rest isn't used for a whole bar are 4/2 time, and shorter that 3/16 time, both quite rarely found in pieces.
As mentioned by Lawrence Payne in an answer to a similar question, it makes sense, and is technically correct, to place the rest sign centrally in the bar, rather than at the beginning, which is where a note of the same value would normally go.
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Not just "makes sense", this is the rule for a whole-bar rest: it goes in the middle. – Brian Chandler May 17 '17 at 10:59
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@BrianChandler - thanks, edited accordingly. What I meant to say was that this rule, unlike so many, makes good sense! – Tim May 17 '17 at 11:10