You just only need to know how to manage with 'Lua'. I think that Lua is an very understandable language to all. An hint: search for '.thn' file that you want to decompile, add an entension at the end of the file that may have '.lua'... ex:
- 'br_01_shipdealer_ambi_int_01.thn' <-- original filename
- 'br_01_shipdealer_ambi_int_01.thn.lua' <-- new filename

REMEMBER: Made backups of the files before you entering in his edition.
Open this new file with SciTE, that have already an Lua decompiler/compiler, and see his content.
Have in mind that 'Lua' is close to C/C++ languages but is very easy to understand.
I hope that this info have some use to all the MODders around.
New missions or whatever is what I expect to see in the future.

OOPS: English is not my natural tonge, so, sorry if I miswrited words or made nonsense phrases. Happy codding and research !

Me, myself & the others.