It would be better to file an enhancement request or performance bug to track this problem.
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BTW, have you tried 18.104.22.168,which has many performance improvements?
And we are looking at this bulk loading enhancement for a future release.
Unfortunately, 12.x is not yet possible since that database supports an app that is not certified on it. Hopefully this will be resolved in the next 6 months or so and we will be able to take advantage of any advancements at that time.
Thanks for the heads up that this is being looked into, as there seem to be some interesting solutions out there for building r-trees that take greater advantage of the significant increases in memory as well as thread counts.