If you want to discourage yourself from savescumming, you could try playing on a lower difficulty, setting the number of quick and auto saves to 1, and only make a named save at the end of each play session. That should limit the appeal of reloading, while still allowing you to recover from a party wipe.
Tactician and Honour mode were tested; they involve changes to all the combat encounters as well as to various puzzles and item placement in the world, etc, and achievements. What is obvious is that the person in charge of that design doesn't share the same opinion of 'cheap one shots' as you have.
That said, if Honour Mode had been included from the start, perhaps that would have influenced some of the other game design elements.
