Option for additional time for initial build phase
The game host could choose a time limit for the build phase which is separate to the time limit for the remainder of the game.
For example, you could have a fast game (60 seconds per turn) but the initial building phase has a time limit of two or three minutes.
The benefit of this would be that, while fast is usually a great option, it does leave not much time for the initial building phase. This would be a good 'best of both worlds' situation.