This plugin will basically allow you to alter the code of a game without requiring you to use ISOs. It works fine on UMDs!
My first project for use with this patcher, which I have titled LivePatcher, was to fix a few things with a game known as Final Fantasy Tactics: The War of the Lions. Those of you who have played this game may remember that it suffers from a stretched, blurry screen and horrific slowdown.
So I fixed those.
Attached are LivePatch 0.1.2 and a potentially buggy set of patches for WotL. If you get crashes or places where there's still slowdown or a stretched screen, please reply to this topic or email me at the address provided in the zip. Note that these patches are untested on the PSN release or any region other than US. Instructions are provided in their respective zip files.
E] Updated to LivePatch 0.1.3
E] Uploaded a new version of the WotL patches
E] Uploaded a version of the WotL patches that works with the JP release of the game
E] Uploaded a fixed version of unstretch.live and an initial version of unstretch.live for the JP release of the game