Well, we have a name for that sort of behavior here. it's called
holding, and it's generally frowned upon. Only thing you can do to avoid it is to play No Double Turns Freestyle, or Sequential, and playing the latter of the two can take weeks. Which brings us to your idea of creating shorter turn limits...
Which is
such a good idea, it's been brought up countless times in about 40 different threads before this one.
Which, of course brings us back to square one, pleading with lack to
Give us our freaking speed games already!!!