Tarbat,
You made me think about editing the database manually, as I don't normally bother when I've got Autopopulate doing all the hard work.
V1.4 uses an SQL core database which I assume is completely different to the database used in V1.2. There is an "edit cell" option which comes up in the MyLog window, but this doesn't seen to save to the core database - still experimenting with that.
However, I can easily alter the NavData.db3 table using SQLite Database Browser available at:
http://sqlitebrowser.sourceforge.net/This works rather well, even though it is a very simple interface. It allows searching, editing and creation of records whils RB is running. Of course, being a simple program, SQLite DB Bowser can make some fairly radical changes to the DB if you're not careful.
The NavData.bd3 contains all the core data including:
Aircraft details
Aircraft ICAO Types
Airlines and 3 letter codes
Airports
Routes
If I was clever enough, I'd write my own SQL database interface so I could examine all the data as I wanted. At the moment, I'm exporting MyLog data using the V1.4 csv export, then importing it into Excel to manipulate.
I'm looking forward to you producing Excel solutions for looking at these csv exports, as I'm sure you will be able to do more than I can!