but that's not true multitasking,
No you only get true multitasking with multiple cores which you don't have on a netduino.
some of the analog pins can only do 2mA"
That's only some what true, my pins run at 5v
(they are 5 volt compliant, but normally work at 3.3vdc)
You mean 5 volt tolerant not complaint, that only applies to when the pins are in input mode not output mode.