So far the only way to get someone to join has been by changing the mod.json;  "ignoreInCompatibilityChecks": true, but now anyone will be able to join and it will throw a lot of peopel off

Oh, you mean duplications as in using multiple bonuses for the same unit? Will have to test if e.g. giving a units a 100x multiplier against buildings but a 0.01x multiplier against heroes breaks anything.

Pretty sure you can write whatever there, but may cause unexpected behavior with duplications (probably the last loaded template just wins). There is, but it isn't a "VisibleClass" so i understand your confusion.

when you say drag and drop the mod, how do they get the mod? Do they still need to download/extract?  I downloaded the zip, and then drageed to 0ad but I got a "failed to install mod" alert. <p class="error">ERROR: Failed to install mod C:\Users\emacz\Downloads\classical-warefare-aea-main.zip</p>\

How exactly do I add bonus damage? These are the two examples I found: <Bonuses> <BonusCavMelee> <Classes>Cavalry</Classes> <Multiplier>2.5</Multiplier> </BonusCavMelee> </Bonuses> <Bonuses> <Herocide> <Classes>Hero</Classes> <Multiplier>1.2</Multiplier> </Herocide> </Bonuses> What do "BonusCavMelee" and "Herocide" refer to? Can I write here whatever? My plan is to add an attack multiplier against Ships, Siege and Structures. x And I am seeing above, there is not "structure" class?