>Hello,
>
>Do you know if there are a way to build a silent installation package without going through a batch file with those /qn parameters?

With IS (specially ISLE), I wouldn't know. I already know a few people who hate it just because you don't have much control over it.

With Inno setup (http://www.jrsoftware.org/) it's clear that you can't, and here's the reason it gives in its FAQ:

Is it possible to do a silent install without using the /SILENT or /VERYSILENT command-line parameters?

No, nor is such a feature planned (it would be abused). If it is your intention to keep user interaction to a minimum, use the Disable* [Setup] section directives.