Hi,
1) It would be more comfortable when ESCAPING calculations (with ESC key), that confirmation dialog had button OK set as default instead of Cancel.

2) It would be even better to be able to disable this dialog and that ESCAPE key would immediately stop calculations without dialog.

I guess, that calculations are not as irreproducible that they must have separate confirmation dialog.

Wrote

2) It would be even better to be able to disable this dialog and that ESCAPE key would immediately stop calculations without dialog.

The way it is designed is the proper way. Often, I just want part of the document
be calculated before entering other stuff that takes minutes/hours. This way
makes doctoring very convenient. Your suggestion ESCAPE/auto-OFF w/o dialog will
do nothing if you have entered an infinite loop that will crash Smath and zap
the work sheet 0kB saved [document is not recoverable].