I would think that MaxiDAS should support bi-directional control.
This is from MaxiDAS708 manual
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Chapter 9 Component Test (OBDII Only)
The Component Test function allows initiating a leak test for the vehicle’s EVAP system.
The scan tool itself does not perform the leak test, but commands the vehicle’s on-board
computer to start the test. Different vehicle manufacturers might have different criteria and
methods for stopping the test once it has been started. Before starting the Component
Test, refer to the vehicle service manual for instructions to stop the test.
To perform a component test:
1. Highlight the Component Test.
2. Wait a few seconds while the scan tool validates the PID MAP.
3. Select the test to be initiated from the Component Test menu.
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Interestingly, the phrase "bi-directional control" is not in the document. The glossy brochure claims that the unit supports "Active Tests" and "ALL 9 test modes". What is not known about the unit is how much of manufacturer specific support is built-in.
Personally, I am waiting for it to show up as a cheap Centec unit at my local HF store
