Finally managed to get the HTC Task Manager 2.1 to work on omnia :D
Previously was able to get version 1.5 working, but it is not as finger friendly as 2.1

Here's the link for the download, install the cab file first. After that, copy the files in 'into Windows' to your /Windows/ directory, overwrite all the files in ur omnia! Lastly, import both registry file and restart the phone :)

A video showing the task manager in action