The convention of the High Voltage SID Collection is to capitalise titles (unless authors explicitly want the titles to appear otherwise) according to the de-facto standard of Standard English; i.e. the form "Lord of the Rings" rather than "Lord Of The Rings". (That there is really no such thing as "Standard English" and that the British English is definitely sliding towards the latter capitalisation "standard" is another matter that you may discuss with me in another context - I am studying English and Linguistics, in case you wonder. ;-)
Note that this switch is automatically assumed (setting the title to the filename of the source file) if you are adding a header to the file, even without explicitly giving the switch.
Example: psidTool.EXE -title:"Squash?" Squash.SID
Example: psidTool.EXE Squash.C64 -a Squash.SID /i$1000 -p4099 /title:"Squash!"