Spectral library
spectral library creation is supported in database manager.There are some default NIST and PRIDE spectral libraries.
You need to enable these and wait mascot download it automatically to use them.
You can also create your own spectral library from mascot results
Report Improvement
Report will only show significant results in default.You can change it with DisplayNonSignificantMatches in Configuration Options.
Others
Recompress function in database status page. Actually, you don't need to stop databases while updating them since Mascot 2.5.tidy_data.pl can clean and compress data. This script is in \mascot\bin folder. You can run it manually or do it automatically in Mascot.dat, just follow the instruction in http://www.matrixscience.com/pdf/2015WKSHP6.pdf.