No mapping of keyboard shortcuts is not user accessible with sqlyog.
I think it is a planned feature but I don't know for when!
Since introduction of sqlyog version 4.05 and have the same functionality, as far as I can see. If it is true that is a de facto standard in the “MySQL world” I think this one could be implemented with the same function. But is it that kind of big hurdle … ?
Please, please, please, allow keyboard shortcut remapping. Most of the tools I have used use F9 to execute a query. I don't really care what it is, but NOT F5 which has meant refresh in Windows since the 1980s.