Use QSS to hide tooltips.
Just create/edit a qt_styles.qss file in the Sigil configuration folder and enter there:
Code:
QToolTip {max-width:0; max-height:0; margin:0; padding:0;}
It is worth asking: how many users want to hide tooltips?
Pros: No need to add options in Sigil, any willing user can control the option themselves.
Cons: None?