Paul Bay had some examples, one of which is now in the Tanaka set. I think it should drop to the second spot, as the JEs have the other sense only.

@@ -9,2 +9,2 @@
-<misc>&col;</misc>
-<gloss>listen up (used at start of command sentences for emphasis)</gloss>
+<gloss>never mind that</gloss>
+<gloss>don't worry about that</gloss>
@@ -14,2 +14,3 @@
-<gloss>never mind that</gloss>
-<gloss>don't worry about that</gloss>
+<misc>&col;</misc>
+<s_inf>used at start of command sentences for emphasis</s_inf>
+<gloss>listen up</gloss>

in jitsuyo, but it's a different sense from either of these 
two. I'm not sure I like this as an entry. What's the 
source for sense 1? Wouldn't it normally be （その話は）もう
いいから, in this usage? I'm not sure I'd want to break it 
up as もう・いいから rather than もういい・から

GG5

I'll propose an entry for いいからいいから.

eij:
いいからいいから
now now〔相手をなだめたり落ち着かせたりするときの間投詞。〕

maybe worth mentioning that it's often reduplicated.

literal meaning

@@ -11,0 +12,5 @@
+<sense>
+<pos>&exp;</pos>
+<gloss>never mind that</gloss>
+<gloss>don't worry about that</gloss>
+</sense>