sanabas, I don't know if I will purchase BNW or not but this is how I see the future with your suggested scoring system.
Making HUGE maps more valuable than standard could be a big mistake.
Most people don't have computers capable of playing huge.
My PC is at least 5 years old, and was only mid-range even then. It plays huge games ok. Can take some time between turns, but I can still play them.
Marathon games should not be more valuable than standard speed.
Most people don't have the time to play them, some people would find them tedious and others would find them to be not much of a challenge.
Just suppose that a stupid old git like me was to play, how would I approach it?
I would just rack up a load of huge marathon deity games, and these are the reasons why.
1 - I would buy a new pc.
2 - I have forty hrs a week spare time.
3 - I am not capable of playing Deity games in the true sense so this would be my cop out.
Get to it.

The ELITE players of the game are all agreed that standard speed is the most correct speed for a challenge, so why not bracket standard speed alone as the most rewarding to play. Quick, Epic and Marathon can then be classed together as less rewarding points wise! Personally, I would just make them all equal, I can just imagine all the moaning and back biting that might go on due to the fact that a stupid old git like me has lots of time to abuse the scoring system.
I hope this helps with your last minute tweaking.
Good luck and good gaming to all.
Again, these are points for empty tables. Sure, you can attempt to abuse the system by playing lots of huge/marathon/deity games. You'll get ~250 points per game. But if standard speed, standard size is more popular, say there are 4 games on a std/std/deity table, whoever is in first will be getting ~300 points.
This is here as an incentive to fill empty tables, as a reward for playing games that likely won't get much comp. Instead of getting nothing, instead of waiting months or years for somebody else to try and fail to beat your score, giving you a bronze medal, you'll actually get something. There's more incentive for the harder/bigger/longer games, because they're the ones that are far less likely to see others attempt them. Just 3 people play the same std/std deity game, and 1st is worth more than an empty huge/deity table. Beat somebody else's std/emperor time, you'll get ~120 points. Set your own time on an empty huge/emperor, you'll get ~120 points.
And regardless of how points get assigned, it's pretty much guaranteed that it will be possible for someone with lots of time, who doesn't care about anything other than their VVV score, to pick the most effective way of playing 'cop out' games to get points. We can either be very restrictive, both in settings allowed and in counting only a small number of games, or we can be more inclusive, reward volume to some extent. If we're restricitive, then participation will likely drop, players will feel forced into certain leaders, certain game types, or players will already have the maximum achievable score (look at civ3, I haven't played that in 7 years, and I'd still only need to play 3 games to get back to the maximum possible score in 3 of the 4 quartermaster categories). If we're inclusive, then those who spend a lot of time playing will get a boost due to sheer volume. This is an attempt to get a balance between those things, to avoid people feeling like they need to play the same game over and over because that's where the easy gold medals are, to avoid feeling like you have to keep rerolling as the inca (or spain for civ5) because that's the only way to challenge the top times, to avoid feeling like most games are pointless because they'll never be worth even a bronze, etc. If you feel you can abuse this setup, then please do.