sotto, by mistake, the visual mode I implemented for ViEmu was equivalent to vim's visual mode when you have ":set selection=exclusive", which is the default on Windows, instead of ":set selection=inclusive", which is the default on Unix systems. This was unintentional, I wasn't even aware of the 'selection' setting, and since I emulated more based on the behavior of vim I saw and was familiar with, rather than on documentation, what you have is what resulted.
Implementing the various 'selection' settings remains on the todo list. It won't be ready soon, as it's somewhat involved. Hopefully it's not too difficult to get accustomed to the 'exclusive' behavior.
Regards,
-- Jon