I think perhaps the most realistic action would be to look at creating a mod specifically for multiplayer. because, fwiw, i think it would be highly unlikely that CA would be prepared to make large changes to the unit speed (especially this close to release). I would imagine the speeds have been set by CA based on a fair bit of testing, and it would indicate that with CA's drive to reach a wider audience base they have chosen to speed the game up.

Possible solution:
I am currently playing an Enemy Territory competitively (a team based FPS). The standard version of the game was very unsuitable to competitive play (I won't bore you with details ;) ) so a mod was created called ETpro, with the idea of balancing the gameplay specifically for competitive play.

ETpro has allowed the competitive ET scene to provide a lot of feedback over the last year and the game has continuously evolved. It is unlikely the developers would be prepared to spend the time needed to this type of ongoing tweaking - especially as the 'competitive' community of any online multiplayer game is usually a very small portion of the total market.

So in the upcoming developers chat it may also be worth asking if mods can be created for online play and also perhaps ask if specific areas (such as unit speed) can be changed. Then try and get a few of the better MTW modders together to start building the new RTW pro ;)