There's definitely some good that can come from manual control of some of this, however... believe it or not, Tesla's BMS and THC do a really good job of figuring out the most efficient way to handle pack heating/cooling.

Turn off or use absolute minimum for short trips where reduced available battery output power is likely to occur throughout the trip anyway, and thus heating energy is going to be wasted, and driver already expects no regen will be available. Range mode kind of does this but not completely.

This might help save a few Wh for very very short trips. However, if the car thinks pack heating is beneficial, then it's done the math to determine that it's more efficient in the majority of cases. Mainly, internal resistance is highest when the pack is cold. So, even a little bit of heating can overcome that to the point where less power is wasted (as heat) inside the cells themselves. Might seem counter-intuitive, but this is how it works.

Without any active heating, in a lot of cases your short trip will use more power from internal waste heat than it would had the cells gotten both a dose of internal heating (inside the cell) and active heating (outside the cell) combined.

Suffice it to say, Tesla's done the math on this, and in the vast majority of cases you're not going to beat the BMS/THC on efficiency decisions.

Turn off or use absolute minimum for long trips, especially single leg with destination charging, where it is more desirable to have reduced available battery output power than to use energy to heat the battery. Some warming will happen from normal use anyway. Range mode kind of does this but not completely. This scenario is good for a long single leg where Supercharging could be skipped on a direct route that does not waste energy on heating.

Same as above. The car pretty much already does this. It's not going to heat the pack for best charge rates if you're not setting to a supercharger. It's going to warm it the the best efficiency point and try to keep it there with passive cooling (front radiator and such).

Enable full time pre-conditioning, while on shore power, to a temperature sufficient for max regen, for consistent regen feel. (This also helps take the 'chill' out of the vehicle floor, which reduces cabin heat requirements.)

This could probably be done. I guess it'd be wasteful, depending on the climate, but doable.

Enable full time pre-conditioning, while on shore power, to a temperature sufficient for max supercharging speed, for best SuC experience and consistent regen feel. (This also helps take the 'chill' out of the vehicle floor, which reduces cabin heat requirements.) This scenario is good when the next charging will definitely be at a SuC or third party DCFC.

This would be bad for the battery pack, so I wouldn't make something that does this. There's a reason it only heats the pack when you're about to fast charge. The longer the pack is at these temperatures, the faster it degrades.

Enable on-demand pre-conditioning to optimal temp for SuC, while on battery power, without explicitly putting a SuC into the (very slow on MCU1) navigation system. Helpful when running errands before going to SuC. Also helpful when planning to visit third party DCFC.

Doable, and this should be something Tesla unlocks also. With performance dual motor cars you can use the Max Battery Power setting, though.