I thought you might be interested in looking at Can ACE3 SItting be enabled in a mission for a specific object?.
https://forums.bohemia.net/forums/topic/238050-can-ace3-sitting-be-enabled-in-a-mission-for-a-specific-object/?do=findComment&comment=3456769
× Pasted as rich text. Restore formatting
Only 75 emoji are allowed.
× Your link has been automatically embedded. Display as a link instead
× Your previous content has been restored. Clear editor
× You cannot paste images directly. Upload or insert images from URL.