Allow a mobile version in order to take advantage of the exploding mobile market using seo to drive traffic to a mini mobile site. It's still early for us to catch this wave.

Easy Way to modify/edit Invoices/Packing slips using a wysiwyg type editor.

the ability to upload a watermark image to automatically watermark all product images including detailed and additional images.

create a base blank template based on 960 grid and allow for blocks to be moved to any of the 16 (?) blocks on the grid for unique template layouts and customization.

when I enter sub-category in left menu - I see sub-categories list in left menu
see how menu work on this site: traektoria.ru

It would be interesting to be able moving all you can see in your design, I mean, to move language block, move shoping cart, logo, etc... right now we just can move and create predifinied modules but it would be great to move it all using drag and drop. I think it´s a very good idea

The current format to display Options is horizontal. Previous pre 2.0 version was vertical. Would like choice of format in Admin.

because generating it and upload-time causes a lot of troubles while developing a new skin because, if the designer has to change the size of the thumbs, you should re-upload every image and this is absolutely not acceptable, a phpthumb-like system would fix it all.

The current vertical structure of the product options inventory page makes it difficult to review and adjust inventory levels. It would be much easier to use if the layout were horizontal similar to the product options variants,

See this thread for discussion and example:
http://forum.cs-cart.com/showthread.php?t=16839

add drop down menu at block templates for categories as most of popular e-retail website like target.com , macys.com , homedepot.com and etc.

"Tags" is a foundamental addon, but it doesn't support multilanguage, this is obviously absolutely necessary

I suggest you to increase dropdown functions (customer's side)
1) It's should be a mega-menu
2)In admin area we will have options: how much columns we need for one section e.g.: Computers - 3 columns, TV and Photo - 6 columns. In appearance section we will have option to set default number of columns, and if we don't insert some number in columns section in dropdown popup, it will use that value - what was in appearance

It is quite difficult for developers to change the site width.. if you have say 3 variables in the admin panel (full site width, left col width, right col width) the system could work out the rest and resize the site making it easier for developers to develop sites of different widths.

Would love to have the option to select RANDOM Filling for Featured Items Block. This way my home page changes items on every visit.

I would like to see a complete Mega Menu with options similar to here http://store.brandammo.co.uk/magento/pronav.html where the user can include images, forms, and even videos in the nav.

Ability to configure blocks availability setting for User groups