Forget the first two! FDA approves the system as a whole, and having a trasmitter “talk” over BT to something else is very unlikely to happen. On the other hand, BT in the receiver talking to anything else would not be too difficult to implement, and would not need any specific FDA approval…
Longer life sensors? I’ve done 3 weeks with one, and 2 weeks almost each and every time. FDA says 1 week max, but I get the best readings from my Dexcom at the beginnning of week 2, typically. Less expensive is a matter of market adoption and competition.
The alerts can be changed fairly easily, but I understand your need for more granular control. Something I don’t need at this time.
My wish list stops at the things that I can do while using Islet on my iPhone:
I use it to log every insulin shot I take, including insulin type, and also when I start with a new insulin pen and new sensor, so I can keep track of how many supplies I need when travelling.
Also, timezone support will be nice to have.
But so far, after 6 months with the Dexcom, I am quite happy with the way it is, to tell you the truth.