No, only ranged potions can make you hit harder with ranged, it depends on your range level.
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you can by using a boll on egg and then a range (at level 13 cooking)
You cannot hit any higher with it. The max hit is 300 I think you may hit more often depending on your range level though. The multicannon doesn't show any stats nor does any range equipment effect the hit rate or hit power of the cannon. However a good technique with using the cannon is ranging alongside with the cannon so you definitely gain faster experience in range.
You don't. Using runescape bots will result in a permanent ban.
Most of them. Besides, you would get banned for using bots.
It depends on what hatchet you are using and what level of Woodcutting you are. For example if you are a higher level you will cut the object quicker than if you were a lower level. Also if you are using a hatchet such as a dragon hatchet that affects EXP gain as well.