I don't have time right now to post a diatribe on the keyword versus word/part-of-sentence prompts, which I was about to post a few times this week, postponing each time to give it more thought.... but in the meantime... I hope not to confuse anybody or give any false hopes regarding the "koohii" list : I don't think I will create a special mode for it.
However the list could turn into a pre-set vocab list that will "hit" every possible kanji from RtK1, and as such, could be used for reviewing the characters. If you set the vocab items as "active", they have a flashcard, so you can make sure you're test all of them. It might be rough for beginners, since you're adding a vocab list of 2000+ items, but certainly worthwhile.
The result will be similar, when reviewing that vocab list in "write test" mode. At present, the writing test mode prompts the writing for one character at a time (eg: 新
ぶん ). It might be doable to create an exception where for this list, instead of choosing the obscured character at random , the same character will always be obscured (the one associated with the compound, in the list discussed here).
As a vocab list, it doesn't matter then whether the entries are on-yomi or kun-yomi, and the original english keywords are irrelevant, so the most common/practical compound to illustrate each character is possible.
PPS: within this system then, it is possible to have a preset list also of exemplary sentence(s) tied to each compound, however let's not get ahead of ourselves