1) Yes, it is.
However, this ties up with question 2
2) the launcher moves files from the selected modfolder and put them in /data, making them the active files. Now, the command used in the launcher is more of a script than a real .exe, so im not sure how well it works on linux.
This overwrites whatever is in /data.
So if you copied it all into data, you'd lose it everytime you played a different faction.
Code:
FileCopy( @ScriptDir & "\..\data\_IMPORTANT_STUFF\Single_Player\export_descr_unit.txt", @ScriptDir & "\..\data\export_descr_unit.txt", 1 )
FileCopy( @ScriptDir & "\..\data\_IMPORTANT_STUFF\Single_Player\Rome.lnt", @ScriptDir & "\..\data\menu\Rome.lnt", 1 )
FileCopy( @ScriptDir & "\..\data\_IMPORTANT_STUFF\Single_Player\menu_english.txt", @ScriptDir & "\..\data\text\menu_english.txt", 1 )
FileCopy( @ScriptDir & "\..\data\_IMPORTANT_STUFF\Single_Player\descr_rebel_factions.txt", @ScriptDir & "\..\data\descr_rebel_factions.txt", 1 )
FileCopy( @ScriptDir & "\..\data\_IMPORTANT_STUFF\Single_Player\descr_mount.txt", @ScriptDir & "\..\data\descr_mount.txt", 1 )
Those are the files you need to copy from play_rome/data/important stuff/single player
to data/important stuff/single player.