In ITMS 7.6 release and higher versions, you have "AeXNSCHTTP.exe" or "AeXNSCHTTPs.exe" packages in \\localhost\NSCap\bin\Win32\X86\NS Client Package\ on Notification Server, where they have all required settings to communicate with NS (according to your settings in NS Communication Profile)
If you are changing settings in NS Communication profile and this profile is added in "Push Agent" settings, then it will re-generate new "AeXNSCHTTP.exe" or "AeXNSCHTTPs.exe" packages with latest new settings of NS Communication profile.
Otherwise you will have all required settings in "AeXNSCHTTP.exe" or "AeXNSCHTTPs.exe" packages and can use silent installation mode of SMA on client PC, without adding additional parameters for agent installation.
"AeXNSCHTTP.exe /s" = you will have SMA installed on client PC in silent mode, which will be registered with specified NS and use agent settings as they are set in "Communication Profile".
Thanks,
IP.