@tzuork,
Apologies for the back and forth with your question. Let me please try to help you, still. 
If I’m not mistaken, by “incorrect plugin” you mean this plugin has a bug? Then would you kindly provide us with the details on it like screenshots of the plugin workflow setup, error message thrown by the plugin (if exists), steps to reproduce this issue. This information should help us understand what could cause your issue and let us resolve it in a short time.
No, unfortunately, the Mouse & Element positions plugin can’t give the coordinates of the typing cursor inside an input field. As it states in the plugin documentation/description - it can return the mouse coordinates and element position.
I understand, please accept my apologies for the misunderstanding and time that I might take from you.
We have just checked with our dev team your user case and indeed the Keyboard Shotcut plugin can’t “understand” where exactly to display the side menu. And also, the Mouse & Elements plugin is not a solution because it can’t detect the typing cursor position inside the input field.
Please accept my apologies once again for the misunderstanding.
Take care 