You won't find many small 'tweak' mods because it's normally simpler just to tell the person how to make the change and leave it up to their personal preference (it also means that you don't run the risk of overwriting other changes you've made to the same file). As such any index of 'tweaks' so to speak would be little more than a series of 'how to mod' guides, the list of which you can find on our Guides, Tutorials & Tools forum.
For major mods, the place to look should always be in their readme file or in their initial release post which should document the changes that have been made. If the modders want to they can maintain a living readme (or a link to one) in the Forge of the changes they'd made.
There's no standardised terminology to describe mods re the extent of the changes they make. The idea has been discussed but it's never caught on. There are broad categories (of which you can find out a little more
here) but it's rather incumbent on the modder to describe his mod accurately to his audience using whatever terminology he thinks is appropriate.
Multiple turns
Myrddraal had to take the script generator down for a short while and will upload it again as soon as he gets the chance.
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