Back on Froyo and GB, you were able to add/edit the wifi_idle_ms string in order to change the value of how quickly the WiFi radio would go to sleep after the display turns off. However, modifying the same string (/datadata/com.android.providers.settings/databases/settings.db in the secure table) under ICS doesn't appear to have the same effect. WiFi remains connected for the default 15 minutes even after the screen is turned off.
My post in Q/A is a completely separate issue.
My post in SlimICS was to ask if anyone else had the same problem (if it's a known issue).
My post here is asking if anyone has an alternate method of achieving this.
But your condescension and insight is greatly appreciated
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