[Enemy armor? They'd be designated as MKAI if anything. There's differences aside from "quad chainguns replaced with dual auto-railguns". Like... shapes are different, they have a different sensor package, new power source, etc. Take one as intact as you can and study it!
Titan? Well, Juggs and Dreads are Heavy. Titan is Ultraheavy. It's less a "suit of armor" than a "massive tank." Slower than a snail in molasses, HEAVY!, hideously strong, armor comparable to the average space destroyer, and capable of carrying the heaviest of weapons. This is a walking WMD. Kai additions are probably "Better armor" and "improved weaponry", as well as whatever else they did to the MKAI suits. The good news is that they're not equipped with Baby Nukes, as evidenced by the fact that you're still alive. The bad news is that they obviously have some sort of unknown line-of-sight death cannon or means of taking you prisoner.
Pro tip: go for the headshots. The armor is obviously stronger there, but the difference is that once you start actually doing something to the armor, whatever eventually gets through is obviously and instantly fatal.
Jugs have railguns instead of chainguns, and some sort of rocket pack on their back instead of the lock missiles. That's as far as you can tell, although the arms have more freedom of motion.
It'd certainly help. Let's say ten-fifteen seconds of charge normally, an energy would probably cut that time in half. Might want to limit it to one pack per armor or else you're risking overload. Shield-wise, you'd want to distribute to you, Al, and Jon to the front with those energy packs. Just take it off, do a quick bit of field modification, and attach; you've seen FD enough to figure out how he rigs up two packs to his armor.
You can't fire the Rocket Shotgun and Quad Chaingun at the same time; the same applies to Lock-On and the Quad RPG. In general, unless you're willing to sacrifice accuracy for volume, it's one weapon at a time. For some weapons, it doesn't matter; you just point a Fluxgun in the general direction you want to electrocute, for example. Repair gun works as long as you're close enough and pointed at the target.
In the specific case, no. Turbolaser is energy-intensive and drains most of the power. You can operate two energy weapons at a time, but you'll go through power like a kid goes through Halloween candy.
You have no idea what happens and no desire to find out. You probably knew someone who roasted ants under a magnifying glass or picked wings off flies; you don't want to consider what the bugs would do to us given the chance. And even if you're not handed over to the Kai as trophies, you've studied enough history to understand that prisoners of war aren't exactly checked into the honeymoon suite by their captors.]