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I don't know why Nordic's solution was that nasty hack with PPI
I think they wanted to avoid reconfiguring SPI interface from the new EasyDMA SPIM to the older SPI one (as it is actually somehow different HW block inside). That saves them to touch/reset lot of registers including speed, mode, interrupt flags etc. Maybe for some engineer it was not nasty but neat and clever trick to use PPI so it could stay working in DMA mode. But still your fix may be actually more practical.
fanoush
@Gordon
Thanks - actually that goes a long way towards explaining how this slipped through!
Now I've made the change that disables DMA for one byte (I don't know why Nordic's solution was that nasty hack with PPI) I was wondering about using it for 2 bytes too. In terms of performance it seems it's probably better not to use DMA in those cases.