I have a similar setup to acadia I think and I only have 51 runtimes. I use external runtimes based on model but I don't sort the items by who made it but by what it is. I have a dresses folder, a shirts folder, a pants folder etc because I don't remember who made what  and I often need to browse what I have to find just what I'm looking for. The exception is the materials and matposes whith are sorted by item. I also have several theme runtimes like outdoors, buildings, holdiays, and of course miscellaneous. I also have a temp runtime for excracting stuff that isn't in zip files like daz.

see here for a more detailed explaination and pictures

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