Splunk supports ZFS under Solaris. As the actual filesystem is the same between the the two systems, it is not simply a performance issue or anything else. At this time the hacks required by a user are completely non-trivial, yet the hacks used imply that support for this only needs to be 'turned on' inside a couple of Splunk binaries which would be trivial for Splunk to do in the next version.
And, here's why all the BSD boxes I run use FreeBSD. If I decided checksumming is too heavy of an operation, you can simply turn it off on individual filesystems or system wide.
zfs set checksum=off
Why not support it and, if you feel it necessary, mention that users may want to disable checksumming?
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