I also recently wanted to have this option with the new version of m2eclipse. The best solution i could find is, to create a configuration with the goal package, and as base directory give a variable name ${selected_resource_loc}. Still you have to go to run configurations page, but at least you don't have to define a new configuration for each project, but use the predefined one.
- right-click project
- run as
- run configurations..
- double click maven build (to create a new configuration)
- give a name for configuration e.g. package
- click variables
- select "selected_resource_loc" and click ok
- write your goal e.g. "package" or "clean package"
- run
The next time when you want to package another project, you can use this configuration again:
- right-click project
- run as
- run configurations..
- select your maven configuration
- run
At least you will not have to create a new configuration each time you want to package, as with maven build...