Jeff,
I see that we don't explicitly say that with multiple screens all the pin 25's should be hooked together. They should. We'll try and improve that in the manual.
Where we do explicitly say don't connect them, such as with pin 26, we mean that. The difference is that pin 25 is an input, and generally you can use a single output to drive multiple inputs. Pin 26 is an output, and multiple outputs on the same wire generally causes issues.
I should ask what you are using to dim SkyView externally. SkyView does have integrated light sensors and does a great job at dimming automatically, so external dimming is rarely used. If you are using it, you do need to make sure your dimming wire is outputting a voltage, not a resistance or a PWM, which is what many dimmers output.
As for your other comment:
The above says in a SkyView system that has more than one display AND dual EMS-200s/221s. So unless you have two EMS units, you follow the first instruction. In standard two screen systems, audio only comes out of one screen at a time. The trick is you don't know which one, so you need to join the connections.
As a semantics note, you can't wire two or three wires in series. To wire a device in series with another device requires an IN and an OUT for the two devices. You need four wires for two devices. Along that line, we'd probably not call hooking 3 wires together "in parallel" either. It's just joining them.
--Ian @ Dynon