Manually editing the file would be a pain considering how it's stored.
How's this: I'll be interstate with RL work for the next two weeks, but when I get back I'll release a basic log editor.
It will be basic - it won't include auto-filtering - but it will allow you to
easily manipulate the file and add, edit or delete entries.
It will save your edited log as a separate (ie outside of SH3) CSV file so you can take it from there and import it into MS Office, Frontpage or wherever to further format and manipulate. Maybe I'll also provide the ability to export the log into SH3 format, so you can plug it back into SH3 as well. Dunno yet.
It will be a stand alone product, ie NOT integrated with SH3Cmdr.
It will look somewhat like this:
Hopefully it will be considered useful.