Draw distance

You mean the distance where low detail graphics changes to high detail graphics ?
This one is up to LS3D engine and its drivers...

Other one is draw distance (or view distance) in missions and its set by mission files, this distance has nothing to do with graphic details.

If LS3DRF.dll or LS3DF.dll are imported to ResEdit, it shows some images inside it and menu named 123.




dll-s are compiled like any program exe files and cannot simply accessed to make changes.

And who wants to fool around with this dll, a tip here:
Menu has ID: 40004.

Example:
If I want to bring up the OpenFile dialog from menu in Notepad, using other program with SendKey function.
I look Notepad Main menu part, there is line: VK_O, 2, CONTROL, VIRTKEY
"VK_O" is Open and has ID 2.

Maybe something like this:
var AppName: HWND;
AppName:= FindWindow('notepad', nil);
SendMessage(AppName, WM_COMMAND, 2, 0);

Works for Notepad.

Can this distance measured ?
In some missions this line can be seen, the line where level of detail goes low.
Now get the distance with 3dsmax ?
Then maybe this value can be found with HexEditor.
Its a long shot, very long shot...