John said
... If you know of a plugin that can change Time signature accordingly to the host's Timeline, it would be very interesting to take a look at. ...
Rayzoon's Jamstix changes Time sig. It is done by manually entering the time sig at the appropriate bar in the drum VSTi.
Please consider this a very strong suggestion for EZDrummer 2 as well. I just started using this for the first time a few hours ago, and am flabbergasted each song can have only 1 time sig.