a. If checking a text region which has a language which does not have a 
Dictionary it should display a message to let you know that it is bypassing 
the spell check as Word does.  Never should just open and close the Spell 
Checking dialog as actually.

c. It should have a default dictionary installed for each installation 
Language and use that if not better choice is available.  Example Spanish 
(spain), if it is the spanish install (binary) version, if you happens to be 
in spanish (mycountry), well it should use the default spanish (spain) instead 
of not checking at all the document. Lets call it a sensible default.

c. Better help and hints for the end user will be very much appreciated as to 
let you know you don't have Dictionaries installed and how to install one.

d. In new documents in Tools - Language - For Selection | For Paragraph | For 
All Text; it should not display weird languages that have nothing to do with 
your locale neither with the installed dictionaries. For example in Spanish 
installation it also lists Portugue and Swedish, but those are not installed, 
not used in the document (remember it is a new Spanish document as the default 
document type).