Cernel's xml is a few posts above. I never knew how to change unit attachments. There's a few that you can add to tech abilities, but I always would make a new unit and replace the old one. Cernel's was the first time I saw an example of unitAttachmentName I think it is, so I could just change the unitAttachment instead for most stuff. I think if I have the tech that places the new unit fire at bid phase, then maybe they'll work when the game starts. At least I think thats what prastle meant. Haven't tried it yet. Idk how that'd work after the game started though. I know there's a way to turn off certain delegates so you can skip things but I haven't quite figured that out yet.
Anyway I think it's all in POS2 and Veqryn did provide some nice examples of stuff. There's a few that are hard for me to grasp though. Basically I look at what others have done, yourself, Zim Zero, Rolf and others and copy it. crazy_german's posts are always informative and several others I can't think of right now.
So I don't think I've actually found anything new yet. Some stuff is just worded differently. I would always see the changes when a new triplea came out, but didn't know how to use them. maybe there just kinda built in to what's already there. Idk.
But yea I was thinking it'd be cool to have a list of "good tricks" or something like that. There's a lot of info out there it's just hard to find.
so far the givesMovement thing hasn't worked quite the way I'd like. I made a bomber an airfield and had it give movement to a fighter. Which works, but if it's in a TTy that already has an airfield and their movement bonus is the same it won't stack. If it's higher, then it'll override the lower bonus and work. I don't think the engine can do that though.