As far as setting a high sell limit, this concept came up in days long gone, right here on Agora.
The idea was that the broker couldn't 'LEND OUT' your shares while they were in an active sell order. I tried this and got the 'ole knuckles wrapped by the QTrade gods who assured me that they only lent them out internally, whatever that means. I was forced to lower the sell price or the order would be cancelled.
In response to NYNNYS comments about proxy voting, I also have 4 accounts and only got the voting slips for the 2 margin accounts. So yes, my belief is the TFSA shares are part of the open season as far as a lend-out and potential manipulation.
Did I say things suck for retail shareholders?
GLTALs
Carl