Possibility to show: one/more item thumb OR one category thumb under category name on main page.
This is a theme thing, modify your theme and you should be ok.
Possibility to show: categories / cities / regions on sidebar - with the option to show ALL.
Now, you have to modify hSearch.php file to do it, we have to change that, we'll do it
Delete the thumb size from front side main.php etc. and move to style.css
Feel free to modify your theme
Make rows non-table and make them css style
Again, modify your theme
Move currency format, decimals etc to Currencies (in backend), It is arguable, but I think it has nothing to do with Language.
Yes, this is in our TO DO list, it should be more clear
Possibility in backend to set length of title and description from items.
I think it's better to set them in the theme rather than the admin panel, on the theme it will use less resources (which means your site will load faster)
Make all buttons css (non-image)
Modify your theme
Make standard top-menu and option to turn off. Give possibility to show menu from category / city / region / custom pages.
I'm not sure I understood you.
Don't take me wrong. I don't want to sound rude. Osclass needs to improve, that's clear, and we're working on that everyday. We also want to maintain some quality and keep it as less resource consuming as possible. Adding more options in admin panel would probably made Osclass easier to use (too many options could make it also complicated to new users!) but also it will make Osclass slower (more options have to be retrieved from the database and processed). We have to find a balance between options and performance.
Anyway, we note all your suggestions.
Thanks