High elves General overhaul anygood mods? Elven embassy trade tarif question

I played my first campaign as teclis so a lot of my current gripes didn't really ever come up, because surprise they are specific to tyrion.

1. An ally army on the opposite side of the fortress gate should not be able to join the battle sieging the same side. obviously there is no elegant way to fix this as they can't both attack simultaneously as the map is designed poorly to only feature 1 side and not actually fight on the fortress walls instead of these little guardhouses in front (lore reasons i'm not crazy)

2. IF i am sieging a fortress gate MY OTHER ARMIES AND ALLIES SHOULD NOT BE ABLE TO MOVE THROUGH THEM FREELY. Thats the whole point of the damn things. they are massive chokepoints that you CANNOT simply go around like a normal fortress in real life.

3. I figured that the elven embassy 5% to trade tariffs was not a very important upgrade as it just increases the tarrif income which unless you are trading with 20+ factions and have at least 10 is going to be a drop in the bucket. Or am i wrong and does it actually increase the trade income from the actual items as well? I've tried looking it up and no one knows for certain.

4. would be real swell if one of the future LL for high elves was capable of riding a dragon. Having tyrion batted around by malkieths dragons getting real annoying.

Mainly this post is about how undeniable underwhelming the "fortress" gates are. In both the actual battle map and the campaign interaction of being easily preggers.

if anyone knows of a mod that fixes either would be real swell.