Hi Nir,
Maybe you mean a "Start service"custom action which, indeed, is not available in Advanced Installer.
However, you can add a "Launch file" custom action and use the "SC" utility to start your service as suggested in the
Start a 64 bit service thread.
Maybe we will consider your suggestion for adding this custom action, but for the moment there are not immediate plans. Thank you for your suggestion.
Best regards,
Eusebiu