I'm soooo sorry! I wasn't here for quite a time. I've been abroad in december and didn't check the thread often and I couldn't work on the hints and questions.
But now i'm back. And the new version is almost ready.
I'm checking the Beta right now and I have to finish the installation routine.
If someone would like to help testing - PM me!
With the new Version 2.0 I can answer most questions asked here:
@pSouper
add/remove items (now up to 24) - solved
hide/show each item (global setting can be overwritten while data input!) - solved
@pico
problem with deleted categories with remaining RT - solved
@jscholtysik (and others)
image-size problem - solved
with new auto-template-function inages can be uniform sized
new with 'click enlarge' function (pop-up)
@frold
much better solution for 'display only one field' with new auto-template
does this article.php thing work???
@Kosse
htmlspecialchars should be OK now, this needs more checking!
@JensZ
yes, table layout can be done with new auto-template-function
@Pauli
oh yes, phpwcms-search-function searches within ExData, this is a hardcode-hack coming with new version!
@Ben
ExData Module is OK with DEV Version up to 1.2.5 - Even I don't know what the future brings, so you have to remain hoping...

@TMerz
jaja, you never have enough!
in new version I made a frontend sort-function - so the user can sort the data by fields. I think this is what most people waited for.
Now, you want to go even further.
I'll give it a try.
and finally @Himmelreich
tönt nach Installations Problemen. Die Datenbanktabellen können nicht erstellt werden. Befolge die Installationanleitung. Bist Du berechtigt Datenbanktabellen zu erstellen? Ev. liesse sich das auch manuell machen, via phpMyAdmin oder ähnliches. Deine Konfiguration???
OK! Give me another few days.