Tray development and minimal, extreme minimal, semi-stand and stand development were discussed in the AZO forum at some depth. The conclusion is that these procedures work best when the film is allowed to stay vertical (e.g. in tubes or drums or tanks) during the non-agitation periods. Adjacency effects (i.e. increased apparent sharpness) does not get as pronounced when the film lays flat. I believe that adverse artifacts may occur as well.