No, nor do they allow for a user to override the 1GB read cache limit. In the link provided, they stated scope of change features may change based on user feedback. But for not, it's geared to the consumer "set it and forget it" mentality. For what it does, it works well, but it does have limitations.
Also worth noting, RAPID only works for SATA drives. NVMe don't allow for the feature to be enabled. I'm not sure if this a limitation in how the storage is addressed differently, or the Samsung Magician app hasn't been updated to target non-SATA enumerated devices.
If you need something with faster write-backs, it looks as though soon there with be a new RocketRAID 3800 series from HighPoint. Essentially, a PCIe RAID card that hold NVMe drives with over 15GB per sec (you read that correctly, Bytes, NOT bits per second!!!) of bandwidth.