Feature Request: Add Glucagon Model to use as non-pump entry

[marionbarker]

NOTE This is something to consider after 3.4 is released. I just wanted to capture the thought while it was fresh. Glucagon injection was at 8:45 am PDT, 12 July 2024.

Is your feature request related to a problem? Please describe. I have started to use mini-glucagon injections for:

• glucose dropping quickly before a meal because I messed up the prebolus timing or amount (and with Metformin, my absorption is slower than it used to be)
• today I tried it for glucose dropping quickly during exercise

Describe the solution you'd like Be able to enter the glucagon dose in the non-pump insulin field with a glucagon selection so that Loop Modeling doesn't trigger the momentum term to give too much insulin.

Describe alternatives you've considered

• Not sure enough of modeling effects but wonder if there could be other limitations to glucose momentum effects when coming up from a value well below target rapidly in the absence of carbs entered into Loop.
• This may be related to changes that would help for low treatments with negative IOB

Additional context On a bike ride today, glucose started dropping pretty quickly. Instead of eating glucose tab, I took a mini-dose of glucagon (1.5 u using a U-100 syringe - I'll look up conversion factor later).

• glucose bumped up nicely and faster than it would have with candy
• Override was 65% insulin needs with target 20 mg/dL higher than typical (110 to 120 instead of 90 to 100)
• Loop started giving me extra insulin in response to the rise - more than I needed
• Part of this may have been jumpy sensor (G7 about to expire after 10-days of use), but glad my ride ended when it did