Often I use hint - the second parameter for L (Ti.Locale.getString) - to specify the default (English) text. In this way, I only have to provide a strings.xml for alternative languages.
I think it would be a small but nice improvement to use the text property as the hint when a textid property is set. Right now, the text (title, message etc.) property is completely ignored if you have a textid (titleid, messageid etc.) property.