Well, if anyone is having second thoughts, here's the old
link to 0.30i to downgrade.
Definitely the way line breaks affect RTF is not good. And actually, though I may guess that it was done for the sake of PG... since you can download another supported book format (ePUB, for instance), it would probably be best to revert to the old TXT handling. Ironically, they break their own preloaded books with the new firmware!