Change revision numbers to decimals??

Hi
I've been around the houses, kinda know the answer but asked
by my boss to find out and if you don't ask...

Is there anyway to hack the revision to allow decimals?

What we're looking for is to use this as a type of branch
(major/small development).

Many Thanks
Adam

TRUNK/
        -> 1.1
        -> 1.2
        -> 1.3
                ->2.1
                ->2.2
                        ->3.1

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