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.
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.
Regarding #2, i don't think it will solve the purpose. Let's say that one post is allowed to have only one merit per sender, but there is a other workaround which involves sending merits to all the different posts of the user just to ensure that fake merits are given. Moreover there are some high quality posts which does provide such good insights that members having huge number of merits do want to give away more for it. Fake merits will be done irrespective of a post's quality or any conditions applied.
If its a interesting/extremely good post which brings some good knowledge to the forum, even a 100 merits may be less and if its a shit post even 1 merit is way more than that person should ever get.