Ah, the Disability Superpower. Good to see that's being of use to someone.
Well, first off, when you define those other senses, make sure that they're defined in such a way that being blind is still actually a handicap, instead of just flavor, so that you actually get a refresh rebate from it. Daredevil is a good example, so I'll go with that. He's got a wonderful suite of abilities, but the downsides are annoying, to say the least:
Being able to hear with the fidelity of a bat is great--until you try to focus down to one thing and pick it out of the noise, or even just try to get to sleep. Outside of a sensory deprivation tank, restful sleep isn't going to happen much.
Any strong smell will be incapacitating; you'll probably have to make Discipline rolls regularly when the skunks are marking their territory and before garbage day (or, alternatively, walking through a restaurant district will be... distracting).
As for a suite of 12 powers, I'd suggest that you have the regular senses--smell, taste, touch, hearing--as "always on" with a "+3 to Alertness & -2 to Investigation" (your situational awareness of the environment is making it difficult to focus on any single thing) that can be swapped to "+4 investigation, Alertness drops to Terrible" in the vein of Listening (you're focusing on one thing and losing out on the situational awareness).
Then, for the other 8 senses, have them require some activation, like a Discipline check, representing the focus needed to take an already exceptional sense and refining it into something new. Like Hearing becomes Ultrasound for a short period of time, or Smell/Taste becomes chemical analysis (with a Scholarship check, probably), or you manage to get the vestigial magnetite crystals in the human brain to work and suddenly you're a human compass (or GPS), or become the human lie detector (again, channeling Daredevil).
As for it being fun, that's really up to you and your GM; some GMs will go "Oooh, cool character, let's work together to make you awesome and epic and tragic" while some others I've played with will go "Oooh, guilt-free buttmonkey for me to abuse!" The only solution there is to talk with the GM and find a consensus. (trite and cliched advice, I know, but there's a reason for that: it's also true).