I believe that you could add a check in the settings, and include the mappings in a text file. In this way, anyone who would like to search in a second alphabet simultaneously will just enable the setting. And you will not only support Greek, but also any other language you want. Creating a file containing the mappings is quite simple and straightforward for any user.

The search engine is very usefull, as the HDD capacities grow steadily. I believe that it worths adding the above feature.

Thanks again

Spiros