Not gonna lie: the "ultrathink" keyword that Sonnet 3.7 with thinking tokens watches for gives me "doubleplusgood" vibes in a hilarious but horrifying way.
If you use any of the more direct API sandbox/studio UIs, there are already various sliders, temperature (essentially randomness vs. predictability) being the most common.
The consumer-facing chatbot interfaces just hide all that because they're aiming for a non-technical audience.