in addition to 'Enter'. As suggested by Poulad at https://matrix.to/#/!cURbafjkfsMDVwdRDQ:matrix.org/$15048789704490836xMIEa:matrix.org
it does already
No. I meant giving user the option to change keys in this format:
Enter : Make line breaks within message textCtrl + Enter: Send message@uhoreg could you modify the title?
Here is an example of 2 different options for it. Image from Telegram's web app UI:

@lampholder now you closed #5006, please keep this one open
@richvdh I don't think this should be closed yet
@theowen #5006 is the issue to follow for allowing configuration of what Enter does
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@lampholder now you closed #5006, please keep this one open