(Edit: this is not a rethorical question. I worked with this dictionary before and if it is indeed allowed to extend it I have work to do)
"The use of words, radicals, strokes, glyphs, phonetic readings and interpretations of the individual items in the Revised Mandarin Dictionary may not be modified or converted into simplified forms.
However, the change of the code according to the contents of the reference table provided by the Ministry of Education, as well as modifications unrelated to the specific items in the Revised Mandarin Dictionary specified above, are deemed as outside the scope of prohibition of modification."
(Source: http://resources.publicense.moe.edu.tw/reviseddict_10312.pdf )
使用者對於《重編國語辭典修訂本》個別條目的詞目、部首、筆畫、字形、音讀及釋義等內容不得為任何修改，或轉為簡化字。惟依教育部所提供對照表內容作字碼改換，或不涉及更改《重編國語辭典修訂本》個別條目所有內容之調整行為，可不被認定構成上述禁止修改條款之拘束範圍。
I'm surprised but pleased by the clause concerning the transformation in simplified characters, and all in all this is less restrictive than what I thought.