If you want to use a sprite file that is larger than the PSP file size limit you have to use an earlier version of Shishi which you can get from here:
http://code.google.com/p/lioneditor/downloads/list
the version .352 is fairly stable and is what I use to bypass the size limit.
http://code.google.com/p/lioneditor/downloads/list
the version .352 is fairly stable and is what I use to bypass the size limit.