1) Thats covered in the Expansion section for the unit and requires a separate PX1000 dedicated for that purpose.
Yes, it is covered in the expansion section but my understanding is that you are listing capabilities of the main unit. The Aquacontroller is capable of handling 8,16,8 probes and to connect those probes, you need PX1000s. Just like the Aquatronica is capable of handling 2,6,6 but you need the power bars to connect the probes. Therefore you should list the ACIII as 8,16,8 if the Aquatronica is 2,6,6. - Does that make sense to you?
2) If it's not listed as a feature on Neptunes page it's not on the Chart. I can tell you that from what I have read, I think that controllers such as the Elos Biotopus only require that you input a Location and the controller does the rest. I have not used one but that is what I believe it does.
Same for the AC, you enter the longitude, latitude and it does the rest. It is covered in the section "Seasonal Temperature Variation" p31 and "Seasonal Lighting Variation" p38 of the ACIIIpro manual (
http://neptunesys.com/AquaController3Pro.3_2_web.pdf).
3) If Neptune sells a leak detector I will List it. All the third party items that one could buy and Modify to work with any of the controllers on the list is beyond the scope of this Chart and may void your warranty if something goes wrong.
Same goes for X10 then. If the vendor does not sell the X10 transmitter, it cannot be listed as a feature. Right? There's no modification required do connect a water detector to a Neptune breakout box.
4) Make sure you have the Fire Department outside when you plug in that 120 Amp / 14,000+ Watts of load. I think you need to reread what you saw on the Neptune website
You can use 8 socket expansion boxes on a DC8. Each socket expansion is rated at 15A max with negligible power draw on the DC8. Each power bar can allow you to control up to 120A.
No need to call the Fire Department if you do this right

. All you need is the appropriate electrical service (say a 200-amp residential service) from your power company and dedicated lines to the socket expansions.
Not that most Reef setups would require such power consumption, but if we are talking about capabilities, then this information needs to be included.
5) Yes it's very flexible and for some people including me that is very appealing, for other people, they might say that the chart does not reflect the difficulty of learning how to program the controller properly, versus other models that are much simpler to use and most times give the same results.
A feature of a given controller should not be omitted because you think that most users will find it difficult to use. I think it is important to mention the unique programming capabilities of the Neptune Systems controllers.
With regards to controlling the Tank Via SMS are you saying that the controller receives Emails\text messages and decodes them? That would seem unlikely to me as emails have a lot of header information that could potentialy send your controller into a nose dive. Please clarify
To clarify, I meant that the controller can be accessed through its web interface using a mobile phone.