Please add the F4-key keyboard shortcut. Huge time-saver.
in general: F4 should repeat the last action (insert a line, apply a format, …)
within a cell: F4 should toggle between variable and fixed cell references, as follows for cell A1, cycling through the options:
A1 >> $A1 >> A$1 >> $A$1 >> A1
if the formula has multiple cell references, the toggling only applies to where the cursor is focused:
= A1 + B2 / C3
The user would reposition the cursor to B2 or C3 to toggle either of those, respectively.
This should be extremely easy and fast to implement. Maybe the function exists already and can be configured, but I’ve not seen any blogs mentioning it.