I thought it was possible but it looks like 1024 byte block size is max (if less than 104G partition). Larger partitions allow higher block size, up to 4096 byte if 411G or larger.
For some reason there is no check for "too large" block size. It most likely causes crash because internal block size variable becomes zero..
It probably is possible to support up to 4096 block size using new large partition mode even if partition is smaller. Of course this will make partition incompatible with older pfs3 and pfsdoctor versions.
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