Let's see.. 1. Sure. Understand you may discover some 2.4 only gear that stops working like doorbells, or cameras, or whatever. 2. Yes 3. Never mind that, it is meaningless marketing 4. Totally depends on your environment and needs. If you are not going to get a proper survey done give it a try. It easy enough to change back. If you have too many AP's too close together you could have a lot of co-channel interference which is really noticeable and causes bad performance. In that case try changing tx power lower or even lowest setting possible. If you end up needing 2.4 then only enable on it on some, but not all AP's and use channels 1, 6 and 11 only.
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