babel-encodings-fonts/keyboards

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Hi,
After looking in it for some time I need to ask two questions:

1. Which of the |default|latin1|latin2|latin5| input encodings is usefull for 
iso-8859-7 (greek) char set? 
If none (as I suspect), why is there a language selection {greek} without a
choise for the corresponding char encoding? I know the workaround is to use
LaTeX preamble: \usepackage[iso-8859-7]{inputenc} but couldn't that be a menu
option?

2. I am a bit confused with mixed text. ie greek-english. I choose the 
document language as {greek} but then do I have to inlude every english
text in \textlatin{...} LaTeX code? Isn't there an "automatic" way by which
when I change to say english keyboard LyX on the *background* uses such code?

Are the answers to these questions already implemented or should I repost them
to devel-list?

Thanks,
Menelaos Maglis