OpenMW: it is not possible to change icons that appear on the map after casting the Detect <animal | enchantment | key> spells
This was possible in Bethesdas engine and done e.g. by the map_marker_replacer_v1.0_by_Stanislas_Bachman mod.
(RM-2519 from redmine: created on 2015-05-05 by Who Knows, , closed on 2015-05-12 by scrawl .)