I'm not sure how hard this would be, but it would be awesome if the rail lines that the cargo trains spawn on would connect in a loop around the map. Also, add an alternative access from PEI to Washington

I've thought about this before and with how rough the terrain in Germany is and the smaller scales of Washington and PEI with much denser location placement I've come to the conclusion that making the 2 trains meet at Yukon while allowing them to move primarily through the larger scale maps is an acceptable compromise. This way it's just much easier to integrate with the current map.
And again with the smaller scales of PEI and Washington adding another over land movement point between these two would feel very unnatural considering that they are only bordering on one side, which the bottom halves of both borders have locations that are supposed to be rather remote. (Paradise point & Holman Isle) I could however somewhat repair Confederation Bridge with a custom platform to allow land vehicles to move between both maps.
And from a gameplay perspective I believe it would be much more interesting for this to be the only access point into Washington as it would be infested with zombies and there would be a bunch of obstacles, which could make it a small challenge.
With the next update there'll be a small crossing at Confederation like I mentioned, but I'm not sure when this will drop as I'm still working on the Coalition presence in Vancouver and I have some IRL stuff coming up (my pre-finals are next week.)

TL:DR: Rails not really possible because of how map is built, connection between PEI and Washington not really viable as there's no place to put it because it's such a small border and it's more interesting with a single connection. Next update will include a small custom bridge so you can cross Confederation with vehicles.

Thank you for the suggestions.

Can you add a custom chart map or satellite map where the airdrop are marked where they could possibly spawn?

While it would require a lot of work I would love to see some custom NPCs with a map spanning quest line.

If possible, add Elver/Arid to this. I really want to do it myself and figure out how to find the X and Y size of the maps, but I'm too lazy to.

I don't have enough time or the skill to add serious custom NPCs with real quests that aren't just gather items.

No new maps can be added because the map has already reached maximum size and there is no space for anything, also Elver and Arid have entirely different loot and game play structures compared to other maps.

make more things in the water. Like the boat of russia but then with zombies and it haves a diffrent name(the boat haves diffrent name). what is cool to in the water that there are like Submarines what are broken. And add a water cave in a German moantain with a submarine if there are some

i know alpha valley loot had to be nerfed for obvious reasons, but I think it would be cool if it still had some of it's normal loot like you could find occasional guns that normally spawn there like sabertooths, rags and bandages in some of the places, make it more comparable to a military outpost or bandit hideout with it's own loot than another boring town. as for the really high tier loot like the shadowstalker/dragonfang/alicepacks just make them super rare

basically make Alpha Valley have the arena loot but at a rate like a mafia/bandit place would rather than guns everywhere, if possible and not too hard

the north western part of the map is actually supposed to be quite military free, mostly containing scorpion 7, harboring a bit of the coalition and keeping military spawns down to a minimum (checkpoint between canada and yukon, crashed plane in canada) and with 3 russian military locations and that one checkpoint nearby, i think it would simply be too much to have more gun spawns in that area, considering its somewhat supposed to be a quiet area for settling down

Hi, any way that you could maybe work on adding the train to Germany? It would be really cool!

hm... maybye escalation's map effects, or something like battlefields "levelutions" to change parts of the map, something like that.