what model of 452 do you have? The 453 has a adjustable trigger with all of the settings you outline however it also has a set trigger and a completely different trigger assembly. As stated the only adjustment on a 452 is the small nut under the spring that will allow a small adjustment in trigger pull weight but will not do anything for over travel or creep. There is no aftermarket fix or adjustment for over travel that I am aware of but some do it yourselfers have made mods for over travel however it comes with some costs, you can no longer pull the trigger back far enough to remove the bolt from the action, as far as creep and pull weight I'd have to recommend the yodave trigger kit from his website rather then ebay, but heck I am bias on that for reason.............
Oh and we need a picture of the rifle in question, it's only fair