I haven't got selfish request. I am merely not convinced by kitz argumentation. I explained reasons.

I thought the reasons were quite clear. I explained reasons why.
but I don't want to change default setting on 1 telnet session at a time.
The one telnet session at a time is a restriction of many modems and why Eric has to close the telnet session rather than keep it open once the stats have been obtained.
Every second is ridiculous because it takes longer than that to gather stats from the modem. You are asking Eric to develop a feature that changes the structure of his code just for you, because I cannot see anyone else gathering stats more frequently than every minute*.
It is selfish because its putting pressure on Eric who already puts a heck of a lot of time into developing what is without doubt the best line stat monitoring app available. Fair enough you can request a feature, but if he says no then he will have a valid reason for doing so.
TBF you are very close to pushing the button. Eric has said NO. That's the final word.
*I think there may have been one person who had it running about every 10-15 seconds, and he was OCD about his stats. He ended up getting banned from here and other forums.