Remap Alt+Enter ?

Is it possible to remap Alt+Enter when in the editor window?  It seems to be permanently mapped to 'Context Actions'.  I suppose some people might find this feature useful.  I do not.  Instead, I'd rather it be always routed to ideavim.  I'd like to use this in my _ideavimrc:

inoremap <M-CR> <esc>

I'd tried adding this to _ideavimrc without success:

sethandler a:vim

sethandler <M-CR> a:vim

Any ideas would be greatly appreciated.