It is nice to see how EMI groups certain items like the creative tab so that vanilla+ items like potions or enchantment books are grouped.

But the problem I have is that sometimes mods make "a mess" in the creative tag grouping and I would like if possible to have something similar to JEI's ingredient-list-mod-sort-order config file, where I can sort the mod order in the list.

This is mostly because most of my Add-on mods are all over the place. I have items from Ars that are 5 pages apart, and some of my Create add-ons are all over the place. So would be nice to make a "grouping " list like this to are least keep an idea of the "what comes after" format of the list. (I do enjoy having all the liquids and effects grouped together by the end of the list.)

I second that, I came to check if it was already requested
JEI has this feature, in config/jei/ingredient-list-mod-sort-order.ini, which is a must when having multiple mods with addon, like the already mentionned Ars and Create, especially when the autosorter goes alphabetically, but treat all lower case as before upper case, so "create: things and misc" is 60 pages before "Create"

Having a config file/listing would allow for real control over the sorting, like being able to group magic mods, food mods, tech mods, etc