Now, as we all know, the Enigma series has all of those options.
I would like more options. I know it's simply put, and may sound kind of stupid. But missions, patrols, and difficulty levels (nice job with those, by the way :oD ) are, in fact, very linear to me. Now, not 100% linear, mind you, but linear all the same. Anyone who has played Artifact will have a better idea of what I'm about to say (not trying to promote the game, just giving an example). What happens is they say "Capture the artifacts." Nothing more, nothing less. No present factions, alliances, mobility limits. The only limits on you are the other players. This is something I would really like to see in Enigma.
Granted it's still fun to play through as the LFN, Americans, or Germans, many a time with different difficulties, I think once multiplayer comes out, it would be better if this restriction were removed. Not entirely, mind you, perhaps you could still limit the vehicles a person could pilot to a certain, pre-chosen faction. HOWEVER, I would still like less linear gameplay.
To use Artifact as a base, everyone starts out with their own boat*. It's theirs. They get to maintain it, watch over it, control everything about it, try and get an income, and try and make it a superpower. As you progress and have more surplus, you can upgrade and add to your ship, buy more ships, upgrade and add to those, hire crew. The more powerful you become, the better you can oppose other players to, say, capture their islands, steal their riches, and, obviously, sink their ships. You can go where ever you want and do whatever you want, society providing. Obviously, you're not going to dingy to shore in broad daylight and "borrow" one of the enemies guns without getting killed (unless of course the element of surprise somehow prevails). But, say you find a profitable island that produces oil or provides a defensible shipyard. Steal it, buy it, whatever. You'd have to be able to move about on land, buying and manning guns... etc....
Spy on enemies, bomb them, the whole deal.
*Or, as I think is happening, you have to get hired to a smaller task and work your way towards Captain.
Now comes the fun part. Interaction. I know we've already been fighting with other players, but that's not the limit. Let's say (branching off from Artifact, now...) each player can only really own one ship. The "buying other ships" and "hiring crew" part would consist of rallying other players to your cause, having them man your guns or buy them a ship to join your fleet. Then, ally with other players, and form your own factions, alliances, whatever. Make or break treaties, trading agreements, anything you can think of. Or, instead of trade, steal it.
The point here is non-linear interactivity with other players. Do whatever you want, everything that war involves (with and without shells), but with no limitation to allegiance. Just let the players do it themselves.
Well, that's all I can think of for now. Comments, suggestions, improvement, and detrimental comments all welcome. Just make my fingers feel like they're tired for a reason ;oD . Or maybe you just want to yell at me for posting a previously discussed topic
EDIT: Ah, yes. Forgot the goal part. Just like Artifact, Tesseraction gives you a goal (world dominance, anyone? Perhaps capture the flag or capture the island..) and a time limit within which the game will reset (otherwise you just get dominant alliances and it's no fun for the unaccepted newcomers). There are many ways to do this, say three hour deathmatches (although you'd have to have plenty of warning to fill all the guns on your ship with crew), two week or two month wars (for those of us who have that much spare time *looks in a mirror*...