I now (when I am copying BIG files to my NAS) press F5, and select F2 to queue but lower the speed of the file I am copying I have to switch as my mad

Is there a way to activate / de-activate this speed limit permanently???
That switching as mad to the queue sometimes doesn't work, because TC copies so fast

TiA
Edit: And is it also possible to Limit the Speed when Syncing Dirs??? I see you can also select PAUSE when Syncing!! So a F2 in Sync Dirs would be handy