About defects, I think, you will have fixed in next version.
* If you click for a while on a card, you have a menu where you can delete.
* About hardcode templates, you have the workaround to use the option "New like this". You can have a group called "templates" where you can store all your new card templates. Then you can create a new ones with this option "New like this".
* And about 100-200 cards that you want to scan, I don't understand what it is your requirement. I think I have something similar but I don't need more that two images!
Thanks, I hope german translation is working!