I'm debating with myself about whether or not I should put active and passive verb stems in the language I'm creating.
The verb structure is already complex enough. It has twelve suffixes conjugated for person, and eleven verb stems that can be combined in different ways to express more compound tenses (like past progressive). The maximum number of these that can be put at the stem of the verb (logically, since some cancel each other out, like past and future, and habitual and instantive) is six.