Now we just need a sapper to build a chair and tie it to the end of a rocket, providing us with a long-range boarding solution. Foolproof plan...
On a more serious note, if the grenadiers end up not carrying grenades, what would be their specialty? Skirmishers are quick and good shots, line infantry are balanced, and foot guards are slow but powerful, but where do grenadiers fit in here?
Also, some naval gamemode suggestions:
1-ship naval assault. Each team gets 1 ship, each player gets 1 life. Could be a competitive mode, a whole crew/regiment commands a ship against another crew/regiment.
Naval Free-for-All. Players are divided into teams of 3-5, each group gets a 2-gun sloop or something, last ship standing wins (or with respawns, the team that sinks the most ships).