As John mentioned that Camphor L' has a natural pesticide, but so have many other timbers.
Regarding the heating the timber in the sun or oven, use care as it can split or crack.
I don't know what facet will be presented to be cut on. However the end grain face is best. the knife will cut in between the grain. Its age old technique, preserves the fine cutting edge of the knife longer.
Cheers
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