Hello,
1. I cannot resolve this problem, try to don't send gray and white items (or add items name in items to send).
2. I'll try to improve it, wait next updates.
3. You can disable option (in advanced general settings) "Ignore Fighting if in Gound Mount"
4. Wait next updates for the fix
Wait next update, I have added code to leave shapeshift when WRobot interact with npc/mailbox