Most of your requirements can be met with a little bit of education and experimentation.

Have you even tried using Virtual sensors yet? Man you have a lot learn if you think coming here with that attitude is going to get you some help.
Its a fantastic product with a steep learning curve and you clearly have a lot of learning to do.
Take a look at my build if you want to see what is possible with a bit of patience and learning.

Sorry if I seem harsh but you need to phrase things more as questions rather than accusations, and also be more precise in your requirement.. Oh... and ask nicely, there are a few people here including myself that can help you get 99% of what you want working.

Q1. Yes by a combination of using virtual sensors and the right controller settings for the job, most of what you want can be done.
Q2. By the use of virtual sensor... up to 3 sensors can be used to control a fan, with AVG, Max and other settings available to sample across 3 sensors per virtual sensor. This is a way to get a fan to act based on any of 3 temp sensors exceeding a max temp.
Q3. If you mean external software sensors... its coming.. if you mean temp at different points in the computer, you need to mount temp sensors of which 4 are shipped with the unit with connections for a total of 8. PA2 expansion controllers which also each have 1 temp sensor connection each Max 6).
Q4. What you want can be done if you take the time to learn and politely ask questions.

As for fans not reacting to temp change in the time you want them too.. thats because you have to tune the controller to the type of temp your trying to manage and also make sure your using the right type of controller profile. Set point controllers can be a little slow to respond to temp change at default settings and curve control is probably the most accurate way to control fan/pump speed. You need to experiment and learn, the device has huge capabilities if you take the time to learn how it works.

BTW the XT ships with an upgraded Heatsink which you can also order separately for the Lite or Pro.

I won't elaborate more than Phatboy has, but he''s right, everything you're looking for is already there. In a few hours I learned how to get most of what I need out of the unit. Since the Aquasuite is still in Beta and still has much more functionality coming to it, I'm always checking to see fi there's any updates.

Gotta agree with phatboy & XNine, This is an awesome piece of kit. I'm no Aquaero GURU by a long shot, but found with a little experimentation & just generally playing around with the unit (& A little Common sense) it's amazing just what your able to monitor & control to with-in very fine margines... We know Aqua Computer are still working on the Beta 4 software & I for one am confident the'll get evrything done...
Would be nice also if they could come up with a reasonably indepth instruction manual, outlining just what each feature can do & how you implement that in conjunction with the other sensors (ie: virtual sensors & how you'd use them in conjuntion with your actual heat sensors).
So, Maybe if they had had a half decent manual, just maybe you would have seen that infact this will (as phatboy said) pretty much do all things your asking of it.. Play around with it, thats how I began to figure things out .. Most of all ENJOY the thing.... It really is quite some thing...I Love it :p
N.

I believe you can, but only through the Auqasuite software. I'm not at home to go through the interface to check, but I'm fairly certain you can. You can set them up with 3 different temps from practically anywhere on the unit or any temp probe.