I spoke with BMWNA and explained the problem. To their credit, the gent I spoke with was sufficiently concerned and has promised to contact my local dealer (who installed under warranty) to get a feel for the extent of the problem.
What they need is to have all owners experiencing this problem to call them so they can build a database. So, if you have a long oil pressure light at startup, call 1-800-831-1117 and tell them what's happening.
Maybe they'll do something about it (hey, a guy can dream, can't he?).
BTW, Bruno, I have also posted on the UUC Digest about using an E28 canister.