>Question #1
I assigned earthworks to units in FoTS... Strange thing is, when i assign the ability, it doesnt show up...so i thought it was a failure; but in the campaign play, the Battle AI deploys them!...It works, but only The AI could deploy ETW deployables. This means the ability is in the game, but its just dont show in the Player's UI for some reasons...
What governs the Buttons that shows up in the UI?

>Question #2
The Toggleable Ammo Switch between Ammo Types is not a form of ability, it seems...

A gun could be assigned several projectiles in gun_to_projectile table, and in extension, the ships that carries them...

My Question is, How the game "Knows" that the projectiles assigned in the gun_to_projectile tables are different kinds, different class of projectile - assigning a projectile of a particular class makes the icon for the projectiles appears in the UI - what governs this? is there a table?

FoTS Ships can switch from Solid Shots, Explosive Shell, and Segmented AP Bolt; not as timed ability, but as toggleable switch...I see FoTS naval guns are assigned with more than a single projectile in gun_to_projectile table...

How does it works? How The Game "Knows" that a particular projectile is the basic default projectile and the others are the alternative? How about the path?

>Question #3
How a particular ability are only assignable to a particular type of unit? What governs it?