[Wil]

Aaaarrghh! Stupid browser deleted all my answers. Here I go again...

1) What was Operation Lightingbolt?
Operation Lightningbolt (not Lightingbolt) was the code name for the activation of the FeeCo Depot main gate. Only the pedantic Phleg used the term, though.

2) How many tentecals do all Sligs have (its less then you think)?
Sligs have five tentacles surrounding their mouths.

3) Where do Gabbits go to develope thier post lungs?
I bet you want the answer 'they go to the Spawnin' Springs' here. Sadly, that was just fabricated material in Sydney's Featured Creature, and cannot be taken for real Oddworld biology.

4) What are the three Weirdos favorite accesories?
The Weirdos love their funny hats.

5) (Really easiy) Who created Greeters and Fleeches?
The Vykkers created Greeters and genetically engineer Fleeches into what we see today.

6) What is the locomotion of the FeeCo. train supposed to represent?
While a FeeCo Train's engile resembles a Glukkon's head, the actual locomotion looks like an upside down bug.

7) What do Slurgs eat?
Supposedly, they eat Fleech offal, but OWI probably mean faeces.

8) In early plot ideas to Munch's Oddysee, Munch would start yelling aloud at some point alerting creatures and characters around of thier presence. What did Abe have to do to get Munch to stop?
I don't remember this - you'll have to enlighten me.

8) What did the early version of Mugs use thier tail for?
Mugs, when they looked more like scorpians, had a three-fingered (yes, fingers) tail that could indeed hurl knives.

EDIT: And I'll have to post my answers next weekend, so Oddsville, you'll have to go ahead of me, or people are gonna start getting rebelious.