website.com/mananger/?a=resource/update&id=1#modx-resource-tabs__modx-panel-resource-tv
I don't think that's possible currently. The active tab is loaded from the "state" (which is written to the registry) and isn't affected by the url. With some serious extjs-fu it might be possible to hijack loading the active state, but that is probably too much work compared to the value you'll get out of it.