I fall into the "don't bother putting TS/AG on anything because nobody would be able to recognize it" camp.
When it comes to the little bugs, as long as they have the right guns, they are just fine without anything modeled onto them, as long as you know who has what. Since all Gants look alike, I am a firm believer in the painted base edge technique. This does require you group together certain numbers of models, meaning you'll probably need more models, but it makes it extremely easy to tell which Gant is in which squad. That way, if you have upgrades on your Gants, you can mark it in your army list and say "blue squad has X".