Thanks.
Regarding your question, in the meantime, you can try using the latest version of FilterByColumn (the one you have is an old version). With that you can now also use it as a command. You can then add these 2 entries to your column headers context menu.
Search by '%1'.dcf (378 Bytes)
Filter by '%1'.dcf (377 Bytes)
Remember to enter the operator and your query (only the column name is pre-entered).