Would love to have dedicated reverb and delay send FX for each drum hit in Beatbox.
For want of not speaking for the dev, I can't imagine this will happen any time soon. However, if you can apply fx to the sample and bake it into it pretty easily. Tap on the cog in the beat box to go into the beat box settings, tap the wave form next to the sample you want and that wil take you into the sample editor. From there you can add and effect, select a reverb and bake it into the sample. I appreciate you can't do this on the fly in a song but it wil allow you to modify the sounds for a specific song.
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... You can do the same with delay too, of course if you change your bpm you'll need to go back to the original sample and rebake it