You can easily create half-time midi beats in Sonar:
1) Select the midi drum data you want to alter
2) In the piano roll, Right click and Select "Length"
3) Enter 200% and click OK
A 2-bar beat becomes 4 bars of half-time!
I've tried this in many different styles including beats with triplets.
Try increasing the tempo if the beat is "dragging" too much.
Experiment and have fun!