Dear TMcJD. Thank you so much for replying to my question. You have hit upon exactly what the confusion is about, without actually understanding my interpretation of Wis. Stat. 801.15(4). I like the way you phrased it, and I will explain my understanding using your terms.
The "motion at issue" is the motion to have the court make some kind of ruling. An "ex parte motion" is, as I understand it, a motion to have the court make some kind of emergency ruling such as in cases of child neglect, spousal abuse, or impending tree cutting, etc. An "ex parte motion" DOES NOT mean a motion filed by only one side in a dispute, because virtually all motions are filed that way. An "ex parte motion" is an exception to the rule, and does not apply in ordinary civil cases.
So, my understanding of sentence two of Wis. Stat. 801.15(4) is that it is a modifier to sentence one. It says that an order to shorten the statutory notice time can ONLY be granted for cause shown in cases where the "issue motion" can be heard ex parte, or, in other words, then the "issue motion" is an "ex parte motion".
That explanation is different from yours. Which is correct? I think my understanding is correct because it preserves "due process of law", whereas your understanding undermines "due process of law". What do you think?