extend / trim with "shift-key"

Is it possible to extend / trim when you are in the opposite command??In AutoCad you can press the "shift-key" and then lines will be trimmed if you are in "extend" and vice versa if you are in "trim".I tried to read the usermanual for Bricscad and this Forum, but cannot find any answers.As an experienced AutoCad user, it will be a mayor step back, in terms of drawings speed, if this is not possible in BricsCad..Hope to get an positive answer.Best regards,Mads Boserup Lauritsen