There are two types of "quick format":
1. CD-MRW (Mt. Rainier). Your 40x Plextor does not support Mt. Rainier.
2. Reformatting a formatted CD-RW without first erasing it using the "Normal Format" mode. The data on the CD-RW is not removed, but only the information structure as to where it is located. This is similar in effect to deleting the files. The disc appears to be blank and during a writing operation previously written but unaccessible files are overwritten with the new files.
If you are starting a packet writing format with a blank (erased) CD-RW disc, Normal Format is not available because there is no underlying structure remaining from a previous format. It is necessary to do a Complete Format, which is the only format possible.
That's why the formatting choices are greyed out when a blank disc is formatted.