Thank you for the follow-up.
Sure — an example of a predefined fraction preset is something like the π/2 fraction
where the fraction is inserted already filled in rather than as an empty template. In such a case, some users may want to insert it as a complete expression and continue typing after it immediately, without moving the cursor back into the numerator.
We understand your point that, for an empty fraction template, placing the cursor in the numerator could feel more convenient. At the moment, however, we are not planning to change the current behavior.
If you’d like, you can also submit this idea to our feedback portal: https://feedback.onlyoffice.com/. If other users support it there and confirm with their votes that this workflow would be more convenient, our team may reconsider the current behavior.