I prefer to package up su separately as well; will look into that next week. I don't think it's wise though to leave out the setuid applets from busybox, as leaving out applets vs. Maemo's stock busybox (such as su) might break some (3rd party) applications. The proper solution would be to make the new su package divert /bin/su. I'm surprised su hasn't been packaged up before though, I hope I won't be in for some unpleasant surprise.