Ok let's look at the first issue, hiding your holdings. Since it seems that practically everyone wants everything visible I suggest the following. Instead of allowing the holdings to be hidden, we allow members to put a delay on the holdings, so you can only see what they've bought a week or two (is that long enough) later.
Now as this would be a rule change mid-competition, something I don't really like, we handle it democratically. I'll start a vote next week, and put a notice in the monthly deposit email asking members to vote. Then we give it until mid June to give everyone a chance to vote. As it's a change, we'll deal with it like a constitution change. Ie we need a two-thirds majority to change the rule.
Does that work for most?
On the penny share issue I'll let the debate continue for a while since feelings still appear mixed.