RoseKavalier
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It's funny, but you can do this in the standard editor. Just type a negative number in any text and copy it into the input field in the timer message properties.
It's even strange that no one but the author of this map came up with this.
In my version of the map editor, you can create ' - ' with an up/down arrow using the keyboard. I've been using it extensively, just not for a long time :(
In general, Liu Xue Lian is one of the most knowledgeable players of H3 there; she broke the 200 event limit and the 48 garrison limit on the map, using a map editor hack by the same person who created the combat obstacle preview.
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Deeply Inundated Dungeon v1.02
*Fast combat on water removed
*Sequence adjusted - harder to win as quickly as possible