What I'm thinking of is a scenario where a MIDI keyboard has each key triggering a different set of automation curve envelopes, each synchronized to host BPM. It would be almost like an arpeggiator, except instead of arpeggios each key would be a looping one-shot of an automation envelope. Possibly each separate key could be on a different MIDI channel or not--I don't know.
Doable within FL, with the Fruity Envelope Generator, a layer, and constraining the midi notes that go through to each envelope individually. Then just automate something like the fruity XY controller with all of them and use that. Could also use patcher for this. Might take a moment to set up though.