Do you not see the inherent contradiction in your point? If you are strongly in favor of universal mechanics, then you can't have "out of the box" thinking because, if you actually have universal mechanics, all actions are inside that universe.
Just because it's codified does not mean that it's not creative.
What on earth are you talking about? How did we go to pulling actions from outside the universe? I said character sheet. Character sheet <> universe.
Let's take an example of creative use of enviromental features to deal with a hazard that the party cannot deal with using only the resources on their character sheets. A mid-level party that stumbles across a powerful dragon for example.
It will certainly destroy them in combat, can keep up with them if they run, and will quickly incinerate them once outside the caverns where it can employ it's flight. So they flee. And the dwarf says "That large room two encounters back, you said that was a natural cave right?"
GM: "Yeah."
PC: "Did it have stalactites?"
GM: "...yeah."
PC: "Ok, when we get to the cavern I want to use my thunderhammer to try and knock a stalactite off the ceiling and onto it's wing. Hopefully that will slow it down long enough for us to get away."
No system of D&D covers this exact eventuality. Even a universal resolution mechanic can only provide general guidelines for this. The GM will have to make a lot of judgement calls.
Is he going to worry about the hardness/hitpoints of the stone? The to-hit roll against the stalactitie? The to-hit roll against the dragon? How much damage will it do? Can it impale the dragons wing? How long will that slow the dragon down for? Does the Dragon get a save? What's it's target number?
Page 42 will not have all your answers, nor does Savage worlds, the Hero system, GURPs or any other game. No system models that exact set of conditions.
But it is plausible, dramatic, themantically appropriate and clever. Any GM worth his salt should allow the attempt. It's coming from outside the rules, certainly outside the listed abilities on the character sheet, but not outside the universe.