I have an update after trying out the biogas canisters, you only get seventeen of these babies so you have to conserve them and pick the best time to use them, thankfully they are very situational, what they do is create a type of gas leak around where it lands, similar to the gas leaks you can find in various areas in the capital wasteland, the gas itself does very little damage upon explosion to anything in the area, only enough to kill a radroach, the real power kicks in once you shoot into the gas or throw a regular grenade in, it creates that burst of flame and knocks down enemies allowing you to kick them while they are down, basically paralyzing palm for non-unarmed combat, its great against albino radscorpions and other uberpowerful things either giving you a chance to run like hell and hide or shoot them with no threat of retaliation! Works well with the Zuh-rong pistol or energy weapons are as a setup for a grenade. The gas also seems to do a bit of damage over time, not anything much though. Its fun but I wish there was a schematic so you could get more than 17.
Oh and in total I found six mini nukes in point lookout, considering how small the area is compared to the capital wasteland thats a pretty dense amount. My favorite thing that came out of this DLC was the ritual knife. It has the lowest AP cost of any weapon in the game at six. This means with my tribal power armor, ledoux's mask and action boy I get a whopping total of sixteen attacks in it with vats, if this results in a kill all of that is restored. It would feel like cheating if it was a ranged weapon.