Tut

We don't take such requests. Chances are you might see something like this in the future, just not per request

We are occasionally discussing this topic internally, but whether it comes to fruition depends on a number of things. The server also shouldn't have mods on every vehicle, and so there's a sense of balance that needs to be maintained. You'll be glad to know it won't be long before the new Dodge Charger arrives on the server though

Maps from other GTA games is something we have tried in the past but didn't find very beneficial for the server and ceased its development. With the server's playercount some areas in the map are more or less ghost towns and any large map expansions to come will face same fate, or result in lower density of players across the map. Jobs from the transportation industry might benefit from map expansions of this sort, but the general criminal/police playerbase not so much. There are MTA servers that trim down their map to just 1 city so to not keep players too far apart.
Maps of this scale can technically be implemented if you apply some clever approaches to how the world is streamed, but we'd still be looking at a great mandatory download size for something that won't benefit us much while also degrading the gameplay for some of the server population.
We would definitely have to rethink a large part of the server with such large expansions/changes and I'm sorry to say that's not in our current vision

That's going to be a no - the end result at our upload standards is also one of the reasons we don't actually accept mod suggestions, and instead poll them ourselves once we are confident in our findings

I'm going to close the suggestion with a few comments 
Currently only the Clan polls mods. We monitor feedback across the server and other platforms for any mods people would be interested in however.
The Crown Vic mod will stay, unless the clan polls with enough votes in favor of removing it - but to that I will say it is unlikely to happen. As DROT said, we might be ok with replacing lesser used civilian vehicles if we were to poll a new police cruiser. The handling of the Crown Vic is something we're currently discussing, but the weight bonus for PIT maneuvres will stay.
The code that enables servers to set new ID's is not entirely consistent, for which reason we deem it unreliable at this point, but we have been keeping a close eye on its development since 2017 and are very interested in its possibilities. For this reason, the Huey mod that we discussed internally also didn't pass as it would take away the iconic Maverick from the community.
I also want to clarify that suggestions aren't decided by one single person, we usually review most internally with the clan and have development/creative which has a set of criterias for what can actually go on our server for quality and security reasons, help determine what works best for us. Also, of course we need to think about what does the server realistically need right now and, what is mostly just adding bloat/dead content