In some cases even impossible. And no, there are so many other advantages JASS has over GUI. The code is much more efficient, spells rarely lag (compared to GUI in which, hell, I've seen horribly lagging spells), you can reuse pieces of your code, importing is much easier, instead of multiple global triggers you can use only one/spell. Believe me, I've said this myself long time ago that JASS is no better than GUI just because of the MUI. Well, now I've completely changed my opinion about this. Learn JASS for a while, practice, and your opinion shall definitely change aswell.
~Daelin