Im right handed and have always casted with my right hand and you dont even realise that you switch hands mid flight its just something ive allways done.I did switch my reel handle to the other side the other day actually so i can cast with my right and reel with my left but i found i cant get the rod twitching just right with my right hand cos im so used to useing my left. And also i couldn't stop reeling with my left hand exactly before i twitch with my right. So much easier reeling with my right hand and twitching the rod with my left. I have had times where ive needed to palm the spool to slow a fish down so it doesnt spool me and also with the right hand free and being the hand that isn't unco for me its alot easier to put the amount of pressure you need/want on the spool.
Thanks
Bron