@Michael: I'm sure you IPS team of masterminds will find a solution if you want to get it solved. Maybe my idea was a bad one, but I'm sure that there's room for some better ideas on this. Tags linking to video/images or anything that's related to a link in general (any code), should show the content in the main post, and when quoted, show a link to the content only, not the content itself (as Luke say, or maybe thumb for images, but personally i think a link is enough). Right, now what to do with tags not containing links: We keep it untouched in quote, because this is most likely pure text anyway.
The big frustration i have with the code tag for example is that it's never ending in IPB. Here you (the IPB Team) with all respect to your team, have to look at phpBB's solution for this problem in their version 3.0. As you may have seen, they use a scroller for code tag, so that it wrap the code inside a box, instead of having a post of 100 lines of code, 5 lines are shown, and to see the rest you need to scroll inside this code box to see remaining lines of code. I hope you are open for constructive criticism, or feedback like i would rather call it when it comes to this issue. I'm scared thinking of people quoting never ending codes as well...
@Luke: Like all of your ideas! :)