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almost all terminals cannot differentiate between Enter and Ctrl+EnterOn the contrary, many (perhaps even most) of them can. This is a matter of having a keyboard map that makes these into two distinguishable actions. For many terminal (emulators, at least) this is indeed entirely within the remit of the keyboard map and not limited by the terminal emulator itself at all.
Easy to find example: The us.kbd keyboard map on FreeBSD, used by the terminal emulator that is built in to the kernel and that provides the kernel virtual terminals, distinguishes between these two chords, mapping the former to CR and the latter to LF.
/usr/share/vt/keymaps % sed -n -e '3,5p;/089/p' us.kbd
# scan cntrl alt alt cntrl lock
# code base shift cntrl shift alt shift cntrl shift state
# ------------------------------------------------------------------
089 cr cr nl nl cr cr nl nl O
/usr/share/vt/keymaps %
Note that to take advantage of a mapping like this, one has to turn off the crnl input mode in the terminal line discipline. Again, though, the kernel line discipline is a separate thing to the terminal emulator and this is not a mechanism of the terminal emulator.