When TDing & I have to choose a replacement, I usually try to find someone who will be able to speak with their new partner. One way to do this is to choose the same country. (Yes, Switzerland has 3 languages and India has 1024...) Could BBO not automate this in Substitute-Any or in the list for Substitute-select? Or even better, let players indicate which languages they speak by checkboxes on a profile tab and sort by language and failing a match, from the same language family.