I wrote a script to automatically update my servers.ini file whenever a new one is released. Then I got to thinking.. how about updating mIRC itself when a new version comes out? So I searched google.. the first result took me to a post on these boards:
https://forums.mirc.com/showflat.php?Cat=...&fpart=I understand that mIRC (and a silent install) can be dangerous.. but wouldn't any malicious user with half a brain simply use mirc.exe itself, and not an installer? The installer adds itself to the Add/Remove Programs list and surely adds some registry entries, whereas the regular mirc.exe can be used as-is and be just as malicious without being as obvious.
Therefore, as explained by starbucks_mafia in the aforementioned post, there are no additional negative effects when there is a silent install option.
As far as I can see, there is no harm in adding a silent installation switch for the executable. Please consider it!