Speaking for User Data Dump (which I wrote) it's challanging to have a "N" element collection represented in a CSV output model - in other words the number of notification devices in total is not bounded - so you can't know how many might be defined. I suspect BAT sticks to the default devices for the same reason I do - these ones are pre created in the database for all users - you know they will be there even if they aren't enabled and so you can reserve "slots" for them when outputing the CSV.
Sort of the same problem with alternate extensions but I cheated by dumping out empty columns for the remaining items up to the max allowed. For notification devices there is no technical max that's enforced which presents a problem there.
I suppose you could have an option such as "All notification devices besides the default 5 that are defined" and dump out, say, up to 10 of them - just leaving the remaining 10-N slots blank if they aren't defined. If there are more than 10 you just get the first 10 encountered and that's it. A little awkward and some tortured wording but something like that might work.
