Hi Keif,
K2 is designed to be able to show "intro" text of items within a category, this can of course be disabled by not having an introtext word limit. However, the downside is, in itnrotext is designed just as a teaser and so all html will be stripped from it.
The only way to show the full item, without hacking the core files is when an item is clicked from within a category or linked to on a menu.
If you wish to discuss a customisation, then please dm me to discuss.
Regards,
Simon
K2Joom.com