nazriel:
Thank you for your suggestions!
:-)To send a paste both codepad and ideone use "Submit", I find that word more natural than the "Save" used by DPaste, because most times what I want is the code to run.
Also, my monitor has a largish font, so paste lines don't have too many columns. So have you tried to put the "Paste settings" on something like a horizontal ribbon at the top of the screen (like an actual program), and leave full width to the lines of code?
Bye, bearophile