Honestly, I can't see 2 wire arrow being a huge request, as most people using an SSP are more than likely using a Federal Signalmaster or lightbar. But, I do know that it would be easy to do with a relay tab on the Signalmaster button. We have used some older SS2000s on Feniex two wire arrows and yes it would have been useful. Now, for pausing a relay or changing lightbar patterns based on park, absolutely! We would very much like to kill our wig wags and change to a slow flash in park, but i'm forced to keep the lightbar on slow flash in all 3 modes, and kill our wig wags with external devices. The control head inputs that allow for the slide switch to be activated had made us think that we could use those, but they only step the slide switch up and not down for "safety". I actually use the priority siren button to activate an intersection pattern on the lightbar. It worked flawlessly in series A, but in testing our series B, it causes the lightbar to shut off for 4 seconds when placing the car in park. To overcome this, I had to use a control head input for park kill.
I think with some more features like we mentioned above, they could level the playing field with Cantrol and Blueprint.
I would be surprised if more people did not want a 2 wire arrow function. We are consistantly contracting to put on a lightbar and a rear window stick. We use the cn signalmaster, and I like the light, but sometimes it is just to big and bulky for where we need it (and sometimes it is what will push us over on price in winning a vehicle bid). The latitide arrow does not do flash functions, so you cant use it as an arrow and a flashing light, so I never use those.
Then then next issue, what happens when you are upgrading a car? For instance we have done a few vehicles that were going from an soundoff interior light package, to a full marked partrol. We use an integrity lightbar, and put in an SSP for control of it and all the other existing lights. Without 2 wire arrow, I can't make the old rear lightstick function... (allthough like I said, they did give me a program to do it so it will work). Heck, how about a convergence network device that would "mimick" a cn signalmaster, plug into the network, and then output 2 wire arrow and a "flash mode" function. So you would assign the software to control a rear cn signalmaster, put in this network device, and just mount it near the 2 wire arrow. signalmaster button would work the 2 left, right wires, hazard button would turn on flash mode, and you could assign the hazard mode on slide 1,2,3.
Lastly, I really like using the feniex cobra sticks in rear windows. They are bright, they are compact. If federal were to come out with one similar based on the micropulse series, i would absolutely use it but I would sure hope they would control it with 2 wires, and not use the signalmaster outputs on the ssp. But I thought they would have figured that out with the Latitude arrow too....
I would like to see them add more inputs as well. I use all 8, and could really use more. AN expansion output bank that is more than 4 relays would be nice as well, say 10? with each output being able to be paused, flashed, steady on...
Also, as a tip in case you don't know. Put your Wigwags on output 9 or 10. Use one of the amp inputs for park detect (we will call it input 1). in programming, assign input 1 to relay 9, steady on, active LOW, open off. This will work as a park pause so you don't need external relays to shut off the wig wags. If outputs 1-8 were still able to do "Active low" on the series b, you could "pause" any of them. we use output 9 for "clear warn" and output 10 for mirror beams. We get requests to shut off mirror beams either in park, OR when the specified door is opening.