Live count of how many characters left

[stoutouloutou]

Hello,
first, thanks for the great work !

I wondered wether it was possible to display, while writing a new sms, just below the text, the number of characters remaining before reaching the 160 limit, so that I can adjust my writing.
For the moment, I use the preview function so see how many "credits" the message costs, but I find that not optimal.
(I'm not using templates, I guess would make the "live" is only possible in this case)

thank you