Extension settings 

Some general settings for glossary2 can be configured in Admin Tools > Settings.

Extension settings of tab "Basic" 

Name Type Default
string EXT:glossary2/Resources/Private/Templates/Glossary.html
string 0-9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z
templatePath
Type
string
Default
EXT:glossary2/Resources/Private/Templates/Glossary.html

Which template should be used to render the A-Z list. EXT: as prefix is possible. This is more a fallback, as you can override this option at various places.

possibleLetters
Type
string
Default
0-9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z

Example: plugin.tx_glossary2.settings.letters = 0-9,a,e,i,o,u

Define the letters you want see in the glossary. This is more a fallback, as you can override this option at various places.

If you deactivate mergeNumbers in TypoScript you should override 0-9 in this option to individual numbers: 0,1,2,3,4,5,6,7,8,9. Of cause you can override this option with help of TypoScript, too.