No, there are no settings for this sort of property.
It is hard coded into the engine that the player will WALK if the SHIFT key is not held down, hence why there needs to be a source-code change.
I spoke with Urlforce (the one who made the Lemur mod) and told himt hat he should make this alteration a flag, so that users can change it if they wanted to. He assured me that most every addition / change to the source will come with a setting that can be changed in the setup.ini file or some other file.
@dumpus:
"Official" is such a strong word to be used here. Lemur V2 is technically official since it was made by official means. It WAS made through the latest source code compatible with V1.07 of FPSC, so there should be no reason NOT to use it to obtain what you're looking for.
The one and only,
~PlystirE~
Urlforce:
Dude, I'd rather be declared a dbpro noob than an fpsc legend any day!