Before New Year I worked under new Search and Replace engine. Now it's 80% rewritten.
Internally - I moved it from MkS core to plugin, and made code factoring. Now it consists 4 parts (classes) business logic, main user interface, search thread, dock with search results. Business logic don't mixed with user interface.
For user there is now are 3 sensible changes:

• Possibility to replace all matches in a directory, not only in the file
• No freeze when searching in directory
• Incremental search. (I am not sure name of feature is correct) When text typed in the Search input - MkS tries to find it automatically, and, changes background of input to green/red

A beta version was released in the christmas edition, so don't expect to find it in this version, it will appear in the next release (or using our branches/dev svn part).