1. The process of sending merit seems a bit annoying. You've to go through another web-page and select number of merit to be sent and then send it. IMO, it'd be better if it could be sent just by clicking "+Merit" button right within the thread.
Check out this script, made by grue
https://bitcointalk.org/index.php?topic=2833350.0. It works flawlessly so far.
2. It'd be much better if you guys allow only one merit by the merit-sender per post. This will reduce fake-merit-exchange or fake-merit-giving. There're people sending tens of their merits to a single post which clearly seems like something fishy.
It won't.