I don't want to hijack the thread, but here's the solution for the yellow doorknobs:
You actually need to edit a line in the .cs file for each door.
Open the JVS_DoorsPack0.zip and find the folders with the .cs files.
Next, open up one of the doors, such as "FrontDoor.cs"
Look for the following line in the code:
$JVS::Content::Type::nodeColor2 = 205 / 255 SPC 176 / 255 SPC 86 / 255 SPC 1;
You need to edit the numbers to the left of the / sign. The first value is for red, second is for green, third is for blue. Ignore the last one, it's for setting the transparency.
Note: the colour value has to be something between 0 and 255.
Once done, save and enjoy your non-yellow knobs.