Is there any way to make the computer use a wider array of weapons? They never use things like ninja ropes, and stick to the bazooka, grenades and shotgun. It's frustrating , becuse on custom schemes they skip their turns alot.
Also is there a way to set up All the weapons and other items like jet packs and stuff?

Thanks,
Chance

Is there any way to make the computer use a wider array of weapons?
No.
If you have installed the official mission editor (requires patch), you can have a look which weapon the AI is able to use.
In the drop down menu for a worm's weapon you see all AI useable weapons with a red border.
Also is there a way to set up All the weapons and other items like jet packs and stuff?

Yes.
Use the scheme "Full Wormage" or use an external scheme editor.