Ah.. I just read the @steemitblog because of your post. I think allowing an arbitrary timelock with varying rewards is probably the best approach. To keep thing simple, STINC can design it such that there are just a few options Steemians can choose from when powering up their STEEM. The longer you lock, the higher the rewards.

This approach will cater for a wider variety of users. Some of us hold a longer term belief on this platform while there are also many who just want to trade.