The setup.exe has internal identifiers which declare "Inno Setup version 5.5.9 (a)" ... Aside from your data, scripts, and packaging, is it modified at all from the default installer at this download page
I haven't yet looked at it too closely, but I don't think the author provided native support for plugging in the sort of "pre-install summary" feature I'm imagining. I need a couple days to muse over how hard it would be to bolt-on the feature, if I can't think of any way to do it without basically rebuilding the whole installer exe then it would probably be better to request the feature from the original author.
Thinking of implementing something like this
on the installer's Select Components page. Apparently not too hard to do text when scrolling/clicking items, although mouse-hover and graphics are a bit more involved (sensitive to display resolution, etc). It seems everything's already out there and no need to reinvent the wheel - although some of that Pascal source looks really nasty, lol - but I don't have time to become a seriously serious Inno Setup expert and I don't want to increase size/complexity (or decrease compatibility/stability) of the installer itself with tons of add-ons. It should ideally "just work" across every WinOS on every platform, with the strictest minimum of external support/framework components.
Also thinking the "Tools" should be given its own description (to inform users what DxWnd/UE/QDP/etc actually do), and autoselected (and maybe also greyed out so it can't be unselected). And thinking that since the mods mostly recycle the same bulk resources as Vanilla while only changing/adding specific file components then a detailed (file-by-file) installer script could be used to reduce the total All In One package size down (maybe a little, maybe a lot). But one problem at a time, haha.