Михаил, obviously, there are a lot of things still should be done: Plugin updates for review, Keeping Oxwall up to date with the new trends and features and the Users Search is including. This is what we are thinking about constantly within the small team. And this is what we are doing, not so fast, as somebody would like. But we move forward and going to improve each point. And we will announce our upcoming plans in our blog, please follow the link:
http://blog.oxwall.org/ .
Concerning the messages plugin user search it works by using the Java Script. And basically you should find the user by the first word and only after this can you make search by second word.
For example, if you have the user Brad Pitt and would like to send him message for the first time, you can't find him by using Pitt. First you should type Brad and after Brad Pitt has been displayed you will be able to use Pitt for search.