No need to use multiple bridges with vlan.
See this excellent guide fro more info on the recommended approach to use vlan:
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
This approach will work for all ROS devices.
Depending on your device it could be some fine-tuning is possible using specific switch chip features.
But first learn to walk, then run.