is it possible to add a attack from another unit or special attack. like say for instance nuke cannon attack changed to nuke bomb, or carpet bombing, also laser tank attack changed to particle cannon. also is it possible to give the player the special feats one gets when becoming 4 star gen like mother of all bombs more than one time per 6 mins like can use 5 in a row then once 6 mins have came around another 5 is possible to use.

In world builder? No.

In a game modification? Yes.

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im guessing this will not work online correct?

Correct. Unless everyone else has the same version.

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Or just modify the level. Dont know how though.

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You can change unit names, armour and weapons by editing the .ini file for your map. The different types of armour, weapon names and weapon appearences can be found in INIZH file in the game directory, which is one of it's .BIG files that contain the games main .ini scripts.