BitComet really slows internet browsing, so i have to shut down BitComet to be able to that. it would be helpful “STOP ALL tasks” button or hot key.
and i do not want to set any limits. i like speed of downloading 
Hi fankas, a little suggestion here, hope it helps.
I use Ctrl+A as my “hotkey”, it selects every single task in the task list. Then I right-click on a task and press “stop”. It stops all tasks immediately. 
If you right-click the BitComet icon in the system tray, a menu pops up with the options to “stop all tasks”, and to “suspend all active tasks”. Not a hotkey as such, but certainly does the job.
However, if BitComet is regularly interfering with internet browsing then you need to limit your global max upload rate as explained in our settings guide.