Do you mean put it in to the KickFlash, or just use from it from C: when you have a KickFlash installed? If the former, why not just try inserting it and comment the MoreLibSpace line from Startup-Sequence? You can always boot without Startup-Sequence and replace the line if you need to. If the latter, yes I can confirm that MoreLibSpace and AfA-OS work when using a custom KickStart in a KickFlash.
By the way, previous version of the AfA-OS libraries had no resident tag so will not work in the KickFlash. I don't know whether version 4.0 has fixed this.
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moto