Daniel
There was a post from Jack that he planned to rework the push level system anyway. As far as I remember and understood the idea was giving each tyre its own neutral push level. Nonetheless I agree that a button or push level fuel saving could come handy sometimes incorporating those things Clayton mentioned, although it probably would, and should, cost more than the few thenths of a second of the steps of our current range.
On the whole I'd like some more strategy calls, like block and attack strengthening the defense or attack skill but at the cost of some performance, mostly if unsuccessfull in attacks case. Or 'Don't overtake' to take advantage of DRS, or avoid overtaking a (slightly) faster car in DRS and blocking it the following lap for a disadvantage of both (as long as he doesn't KERSes by, and perhaps tries to loose the offender to avoid this happening again next lap).
Your first paragraph actually sounds a lot like things James Greer has suggested in the past, and not Jack himself.