Basically, yes. All you need to do is open up the digatmos.mnu file using your favorite text editor(ie..Word, Wordpad, Notepad, etc..) and insert a section called Stability Indices and under that section you would then enter the scripts listed above. The main issue here is to make sure that you follow the formatting conventions as shown the digatmos.mnu file. For instance, the word "Stability Indices" would appear by itself starting in column 1. You then add a new line and space over to column 2 and enter "K Index"...without the quotes. You then space over to the vertical bar section, insert a new bar, and then enter the script. Then repeat the process for the KO, CT, VT and TT scripts.
If you're still a little confused after reading this, you can send your digatmos.mnu file to email@example.com
and I'll fix it up for you. You could then look at it to see how to implement future changes. However, if you do these modifications for yourself, make sure you close DAWS first, then make the changes -- save the results, and re-open DAWS for the changes to take effect.