Using a higher or lower acceleration has no affect on the [delay] tag, so animations that use it always play at the same speed, no matter how fast or slow the rest of the game is going. It looks awkward, and it can be annoying to wait for animations to complete.

It would be better if the delay time scaled with the acceleration. The implementation of the tag in WML would not have to change: The number of milliseconds used in the tag could be understood to refer to normal speed, and on other speeds, the milliseconds would automatically be adjusted.