I suspect what it does, it checks out your basal setting, then uses the duration of insulin, compare's it to the rest of the information, and perhaps suggest a slightly different tweak, perhaps how you've step up or down your insulin might be better being tweaked!
Must admit the more I think about it, the more that I'm not sure, as well can't see how it know enough to suggest something!! But saying that I haven't seen the software!
I've only ever had one suggested tweak from my pump nurse, and that was in the very begining, I'd been pumping for about 6 weeks, and when they looked at my basal setting they felt that I had too much of a jump from one hour to the next one, so suggest that I might be better to put a couple small increases over a couple of hours to reach where the final amount! Apart from that I've sorted everything out myself..
@sugar2
I've had a lot more practice than the others, the more experience you tuck under your belt the better it gets...