When I translate in OmegaT, I rarely use my mouse, since most of the actions I need can be performed using only the keyboard. But getting a popup menu on a misspelled word in the current segment might be a tedious task requiring multiple keystrokes on the arrow keys. To work around the issue, I've written a script that moves the caret (text cursor) to the nearest misspelled word (calculated from the current position towards the beginning of the translated text), and shows the context menu on that word. A bit more on the script in my blog post. And the script itself can be downloaded from GitHub.com and SF.net.
