Hello Alan,
> I do have Geiger's book, but was assuming that this "Encyclopaedic
> Dictionary of Pali" would be someone more in depth, perhaps even dealing
> with particularly problematic or complicated Pali terms in relation to
> various sections of the canon and non-canonical commentaries.
It's not a dictionary of Pali, it's a dictionary of Pali literature.
As to the Pali terms dictionaries, I would recommend a dictionary by
Margaret Cone (see Pali Text Society website), and a dictionary by Ven.
Nyanatiloka
http://www.palikanon.com/english/wtb/dic_idx.html .
Metta, Dmytro