This is similar to Follow Me and Swim After Me . The only difference(besides working with all mods) is that you can configure which actors you want to be able to swim. Enabling/Disabling is based on keywords. The default settings will only enable npcs and vampire races to swim. If you want every actor but vampire/undead to swim, then disable those options.

Synthesis Patch Framework.

Settings work based on the flags below that map to skyrim actorType keywords. If an actor has a setting that is not enabled, it will be skipped over. e.g Draugr have ActorTypeUndead and ActorTypeCreature. If you enable both, then draugr will be enabled. If you disable undead, draugr will be skipped while any creature without the undead keyword will be processed.

• AllowNpcs - bool: Allow Npcs to swim in combat
• AllowCreatures - bool: Allow Creatures to swim in combat
• AllowVampires - bool: Allow Vampires to swim in combat
• AllowUndead - bool: Allow Undead to swim in combat
• AllowHorses - bool: Allow Horses to swim in combat
• AllowTrolls - bool: Allow Trolls to swim in combat
• AllowGiants - bool: Allow Giants to swim in combat
• AllowDwarven - bool: Allow Dwarven to swim in combat
• AllowDaedra - bool: Allow Daedra to swim in combat

tonycubed2 for the original mod/inspiration.