Hi Greg,
In most cases, you can hold down alt and shift, and click on a label you want to localize. That will bring up the localization tool with that label selected.
Second, if you have the top-level "SayMore" item selected as in you screenshot, yes you get the whole list. But if you select one of the other labels, you can narrow down to what you're interested in.
On Ampersands, these are for keyboard shortcuts; e.g. a button with "&Close" will be selected if you type alt+c. You can omit the entirely, or put an ampersand before the character that you want to be the shortcut.