You have to add the expansion ID/value together to get your desired results. If a feature is specific to an expansion, you need to enable that expansion if you want that feature. So if you just want Iksar, then you only need Kunark.
For instance:
0 = No Expansions
264 = Default, Planes of Power, and Kunark
511 (default) = Everything up to, but not including, Depths of Darkhollow
3136 = Default, Serpent's Spine, Prophecy of Ro, and Gates of Discord
16383 = Everything
And your example of 31 would be Classic, Kunark, Velious, Luclin, PoP, and LoY.
Edit: This may have changed in the last year or two. My last server closed in 2012 and I had it locked down to Kunark only using this method and it worked.
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