I got dnetc to work this way, keeping /programs0 always in rw mode so dnetc can store it's files there. Any concerns about doing this?

No major concerns - the worst you could do is trash that one 32MB partition, but in practice ext2fs and fsck are pretty resilient. Worst case scenario is having to rebuild that one parition - but at least your music paritions would be fine. In the long run I'm hoping that the excellent ext3 work being done can be included into hijack, and this issue disappears.