5) Most tracker editors have + and - buttons somewhere on the user interface that let you switch patterns. (I've only used other tracker editors but not the original Protracker.)
6) The latest version of Protracker for the Amiga that doesn't do wierd stuff is 2.3 something I think. Also, DOS protracker players use command 8xx to mean panning. Amiga doesn't support panning on the Protracker editor so whatever command 8xx was used for before will mess up on the Amiga.