In my experience, having to adapt, update and include scripts from all over the internet just to include common prerequisites with your installer can take a lot of effort. Assuming that the installer would download the prerequisites from the vendor's site, Inno Setup would not be bloated. My suggestion is to just provide a simple compiler directive to tell the installer to download the required prerequisites during the installation. This is a requirement that is by default included in just about all commercial installer builders, and in my opinion, it would be a neat feature!

For installations that do not wish to use an internet connection, there could be another compiler directive specifying the location of the prerequisite files on the users machine (probably in the 'temp' directory) during the installation. This way the prerequisite files never have to be included directly with Inno Setup, which keeps the size of Inno almost the same as what it would be otherwise without this feature.

Agreed again, Intellisense would be really cool :)

I agree, I would love to see this feature in IS. Please implement it!