New/improved:

Export: New option to export only the active action + frame range settings. Thanks to Jesper for funding this request!
Export: New buttons to set/unset the selected bones as custom bones
Remap: New option to use the current pose or real rest pose when redefining the armature rest pose
Remap: New “Rokoko” preset compliant with new Rokoko bone names convention

Fixed

Export: Bottom bones not exporting
Remap: Freeze armature incorrect rotation