Thanks Lu. I can't discuss the effort, I am glad for the time you spent on the project, but about the utility I disagree. It would be really usefull (IMHO), think for example this Use Case:
You have a table with a column for country and you want to filter for multiple country, or you have a column with User Profile and you want to see only selected profile, multi selection I think could be a very usefull upgrade.
However thanks in advance for your support.