The Saker cannon would be a nice addition to the British unit rooster. It could be a new unique unit for them that will replace the [Falconet]. This medium cannon was often used by the English.
It could possibly have the innate special ability of shooting a cannonball that will bounce off the ground, which will cause additional damage to enemy units. The reason for this bouncing effect is because the Saker could fire round shot cannonballs made out of iron, which would act like a bouncing bowling ball on land that would not stop after the initial impact, but continue and tear though anything in its path.
According to the wiki page for the Saker cannon it is stated that this iron round shot was rare before the 19th century, but on the wiki page for the round shot it is mentioned that iron cannonballs started to generally replace stone cannonballs by the 17th century. Therefore, whoever wrote that the iron round shot was rare before the 19th century must have made an error. Especially when taking into account that they choose to describe this solid cannonball for being an explosive shell which it wasn’t.
The Saker could have something else that makes it special, while this bouncing cannonball effect could be available to most cannons in the game but as long as it doesn’t upset the balance.
Maybe they could also get a unit that uses the Nock Gun. The unit can go by the name [Nock Gunner]. The Nock gun was a flintlock firearm with seven barrels and was used by the Royal Navy during the early stages of the Napoleonic Wars.
However, flaw designs of this firearm were quickly revealed as it was used in battle. The recoil caused by all of the seven barrels was powerful enough to injure the user or broke the shoulder of whoever was firing the gun. Due to the shortcomings of the Nock gun its service in the Royal Navy only lasted from (1782 - 1804).
I originally suggested that the [Nock Gunner] could be a cheat unit in a post I made earlier this year due to the problems and short lived service of this weapon, but maybe it could become an actual unit for the British.
Since the Nock gun was used by the Royal Navy the respective unit that will be armed with the weapon could possibly only be trained from the Galleon, Fort and the Outpost.