Mantis 1.2 was a big leap forward with plugin support and enables easy customization without modifying the core.
One of the changes in Mantis 1.2 was the shift from Simple/Advanced views to configurable views. The Form Config plugin provides a simple interface for column customization.
The Form Config plugin can be obtained from:
See user-guide.txt file in the docs folder of the download
Please feel free to reply with any comments, feedback, contributions, or suggestions.