Hello and welcome to the Akelos forums!
Akelos has l10n and i18n builtin so you're right - you don't need them as seperate scripts. Akelos uses ADOdb for database connections and it's possible to cache the tables (if my memory serves me righ)... There's been discussion either here or at IRC. forum discussion
About TBS.. I don't really know what its advantages are. Have you checked out Sintags witch is used by Akelos and is pretty similar to rails's implementation?
I myself have migrated from Smarty and ez_sql to Akelos =) So it's possible
-jyrki
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