You can add these options in the Files menu :
To do so right click Files in Plank and open New Window As Administrator.
Navigate to /usr/share/contractor.
Right click and Create New File > Empty File with the following content :
Name=Open folder as root
Description=Open current folder as root privilege
Exec=gksudo pantheon-files %U
Save the file as folder-openasroot.contract
If you copy and paste the content, make sure to make an extra keystroke e.g. hitting Space at the end of the last line. Otherwise the content will not be saved if auto-save is checked ( Scratch > Preferences > Save files when changed ). This a known bug.
For Open file as root create a new file in /usr/share/contractor with the following lines :
Name=Open file as root
Description=open file as root with scratch
Exec=gksudo scratch-text-editor %U
Save the file as scratch-openasroot.contract.