I didnt want the link because (a) users get lost and (b) it resets the selected values as some users have commented above.
So I wrote a little piecs of code that :
a) displays a single lookup box (needs to be in the list)
b) when the user enters in here a value that exists in the multiselect ootb box then the button "add" appears
c) when the user enters in here a value that does not exists yet a button "insert" appears that under the cover inserts that new value in a list
obviously this works only when your reference list has just 1 column that is required such as e.g. a buch of codes or numbers and not when the lookup list has multiple columns that all should be filled in. (in that situation, dynamically add some more fields using jquery under the insert button).
code: http://edward.de.leau.net/sharepoint-lookup-add-insert-field-multi-select-lookup-column-20130608.html
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