The restore wifi option should work (it does over here), but it only does so if wifi was enabled manually from within koreader first. That means that if you manually turned wifi off before suspend, it will NOT restore on resume.
Wi-Fi being turned off by the automatic timeout will not impede the feature, though.
Note that it will also take a few seconds, possibly as much as a few dozen seconds after resume, and it might silently fail, especially if connectivity is bad.
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