gstream-set_cursor_blink man page
void set_cursor_blink(int cb);
Sets the number of cursor blinks per minute - the cursor will be turned on around CB times a minute, passing 60 would make the cursor turn on approximately once per second, for instance. If you pass null, cursor flashing will be turned completely off.
Typical good values range from 50-80, but that is a matter of taste, of course.
Note that cursor blinking requires the timers to be installed as it uses a timer interrupt for timing the blinks. Default is off (0).