viewer.toggle-toc is remapped to <ctrl>t instead of <ctrl><alt>t. Many people use <ctrl><alt>t to bring up their terminal, so it's a common conflict that can be avoided. <ctrl>t is also the shortcut for the same action in Calibre, so readers coming from that reader have one less new shortcut to learn.
viewer.toggle-tocis remapped to<ctrl>tinstead of<ctrl><alt>t. Many people use<ctrl><alt>tto bring up their terminal, so it's a common conflict that can be avoided.<ctrl>tis also the shortcut for the same action in Calibre, so readers coming from that reader have one less new shortcut to learn.