It would improve the game immensely?

It doesn't matter that the player is good or not, but that it is an achievement earned. Not a hard achievement, but still an achievement.

Shambles might be an over exaggeration, but the in game credits earned for time is pretty bad. Not saying it should be like the old versions where you could credit farm an area, but increased (like 5%) credit rewards for missions would be nice. Instead to earn a lot of credits your forced to play with 3 other max levels to earn the max amount of credits possible on heroics since you gain more creds while in a group currently.

But if you earn it why not make the little player icon available on all servers. It doesn't make any sense not to. If you earned it you probably have an okay to great knowledge of the classes.

The in game credits should be increase. It punishes the players and doesn't fix credit farmers. Some ways to fix this are by increasing mission reward credits to something reasonable, adding in something similar to the "WoW token", or adding in special credit missions like a "heist" mission or something. Things on the GTN cost way to much and you have to put in more than what should be necessary to gain credits. The SWTOR economy is in shambles and needs to be repaired.

The ability to have the "legendary player" status should appear no matter what the server. This is something that should be across all servers. It makes sense and doesn't change anything so it has almost no reason not to implement. I don't want to have level through the story on different servers just to keep a status. I'm still working on achieving it, but I kind of don't want to now because it won't show on another server if I play on a different server.