I'm not a fan of the access systems either, most companies i've found just use them as a expensive way of turning the truck on.

Most operators leave the equipment switched on & allow it to switch itself off after 5 minutes as there to lazy to press the button.

Another site I looked after the operators used to leave the keyfob on the truck when it was unattended.

I also much prefer the factory fitted plug & play option against a aftermarket system bodged in to the trucks wiring.

Davis Derby tech support is pretty good here in the UK & if you point out any issues you find with there products they do take on board comments & work out a fix.