I doubt that this problem is really related to toMOTko.
Are you able to use the japanese input method successfully with other applications? I don't know how it works on Cacko but on Sharp's ROM, I have at least two ways to enter japanese text. Either, I type the sounds (like k-a for ka, and r-a for ra, then t-e for te), then, I hit space to choose the proper kanjis (for karate, in this case) and enter to confirm. Either I draw the kanjis using the pen on the screen. Then the word appears in a temporary text field which I can transfer clickling a special arrow button in the field that had the focus before I invoked the japanese input method.
I hope it helps.