Uhm, just for curiosity, are you (the guys with the "reload bug") using a ad-block css style? Because I've removed mine (fanblock-css-style or similar name for block the ads) and at the moment I have no "weird reload" .
Finally finally I've solved this bug (without remove/disable the webkit2 features), in your interner plugins folder remove (or better move to another folder) the JavaAppletPlugin.plugin this fix the reload bug!
Maybe could be also the Flip4Mac WMV Plugin.webplugin but I think is not this plugin, I don't rememer well because i've deleted from the folder these two plugins 1 week ago and untill now I haven't got any "unwanted reload" (before do it, safari reloaded the tabs 1-2 times any 2-3 hours)
(when you need java you can put again the plugin in the folder, or wait for an update that fix the bug )