Does this plugin works in Joomla 3.xx ?
It installed without error, and seems working OK. At least it appears so.

I duplicated all settings from one Joomla 1.7 website and cannot get rid of pagination in my 3 Items listing at homepage. (Home menu link with category/ies settings, doesnt matter what i chose. I tried everything but Css4K2 wont respect my template override setting in menu item.

It seems as it take only template setting from a K2 category that has lower ID number.

Short said it wont respect settings for template in Menu Item and doesnt respect settings for hiding pagination. As those settings in Menu Item dont exist at all. All my settings for Css4K2 are as they are on other websites where it works OK.

I installed Css4K2 plugin for J3 from Github, same problem.
Checked with phpmyadmin and it seems that K2 make its part of job well. Same K2 Menu Item link and settings as in old Joomla sites.

from K2Joom.com it says css4k2 is compatiable with j2.5 and k2 2.5

I believe so. But strange that you can install it without errors.
There is some version for J3 at Github.

Could be nice from him to write why is difficult to adapt one php file to new J3 and new K2. If nothing you can learn something new.