How to ask a person to add time

How to ask a person to add time?

[Sansen]

Hi,

This option of adding time to the clock manually is not available. However, could come in handy to coaches when teaching their students by introducing this time factor. Giving their students puzzles to solve for a limited amount of time, or on the other hand deciding the duration of a lesson.

Thanks,
-Sansen

I think that this function may be in need.
Sometimes, when I play with my friends, they just don't have time to finish there games. And I would like to give them extra minute or two.

There may be a button like take back, which gives you ability to propose your opponent a little bit of time.
I think not only me will be grateful you for such thing.