1. Not exactly possible. Pressing the "swap hands" key is interpreted by Minecraft as a left-click. It works for aircraft as their cannons are both fired and aimed by right-clicking.
2. Done. See #development log for Aug 28.
3. Pending feedback.
4. Have thought about that, but I would like to hear a use-case for this feature.
5. Unsure.

Every other week I see a new suggestion related to movecraft on the site or in the discord channel, yall should rather pile these ideas up and release them bi-monthly instead so we some development and ideas for other aspect of the server that are lacking, I fear at some point movecraft will be so far gone that if a ship is older than 3 days it will be rendered useless and get scrapped, Movecraft has stopped being fun or people like me who just wanted to build ships and have fun with friends on it and now the only ones enjoying and demanding for these changes are the select few people in the elite movecraft cabal.

howdo any of these change ships what?

1) Fair enough
2) Fair enough
3) The Dreads feel a lot more active like they can't be bullied anymore. They have just enough speed to chase at least 2 - 3 salvos in combat conditions and 1-2 in a chase but not enough to cripple cruisers.
4) It would be good for ranged fighting, say you want to fire in the distance or pressure an opponent without wasting tons of ammo, in addition, a lot of us like to split and alternate fire between rear and front. It is possible but can be a pain to set up and a pain to undo.
5) I think this would balance a lot of combat situations, 14 inch suffers at close range due to the extra firepower+reload speed. 14 inches just barely shoots above 12 inches and even at a range 12 inch can be better as you have 2 extra guns which evens out the slightly lower range. At close distance its not at all fair for the 14 inch, as more likely to penetrate the terracotta. I have discussed this with some folk and factoring in the expense of 14 v 12 inch I think 14 inch needs a unique property. By adding this, the 14 inch has a purpose... while no it's not going to make it better, it will at least establish 14 inch at a ranged engagement the better shell while 12 inch being better for brawling. This would lead to diversity among dreadnoughts in a Navy.

In addition, this would only lead to minor changes to playstyle,it would need to be done so that in close range the 14-inch does not accelerate too fast, rather after traveling a chunks distance, it begins to accelerate at af faster velocity toward a target.

I agree with every single part of this, especially the dread speed increase and the 14 inch shell changes. 14 inch just seems like something only newbies use because they think bigger=better and it should be more nuanced than that.

Ashes
Dreads trial behind cruisers by 6ms and destroyers by almost 9ms. This means dreads in a formation are useless. In an engagement dreads cannot hold their own to to cruisers ability to fight in a way it can hit the dread and retreat to render without getting hit. The new 12ms is not enough, but its a good step forward making the the speed difference 4ms. This means the dread has a longer window to fire which is importance for balance and also the fact due to the size or a cruiser perhaps every 4 shots will miss.

The 14 inch is to add an element of dynamic behaviour and complexity. 14 inch is not as good as 12 inch at any range, having 2 faster firing guns will always be better. To make damage higher on 14 inch would brake gameplay. But to make them faster at hitting targets at range would allow them to better hit shots and give them a reason to use both in a navy. This would establish the 12 inch as a brawler but the 14 inch as more a sniper.

Shell diversity in general is just something movecraft needs. Even if the shells can't be altered, then perhaps cannons that are split into groups that have their own pros and cons such as longer range, higher damage, higher shell velocity, more accuracy, faster reload, and vice versa would be very interesting to gameplay and would open up more specializations in movecraft combat than just "I'm good with a dreadnought." It should be more like "my playstyle for (enter ship here) is more aggressive so I'd want faster reload" or "My playstyle for (enter ship here) is more a support/artillery role so I want more accuracy/longer range.

Also sorta related but dreadnoughts seriously need a render distance boost. For a nation's flag ship, they sure are blind sometimes.