I use binoculars for weapons, like everyone else has said, but I like doodstormers stats, too. Pretty handy.
As for walkie-talkies, weapon parts, too. Also I was thinking before about just using them to be able to make a coordinated strike from a large gun. You know how all ranged units who know about the attack and can communicate can make an attack all together? Just give your officer in each squad or just a regular infantryman in each squad a walkie-talkie. Then, attach some walkie-talkies to your big cannons (which I know doodstormer has a couple of). That way, they can make a coordinated strike.