Pretty sure it's just down to the nature of MIDI that it works with note ons and offs and doesn't recognize "held" notes as such. If a sampler doesn't care about note-offs it's probably only because the samples are "one-shots" that are expected to play all the way through.
You can use a MIDI filter to filter out one or the other before it gets to the plugin if you're having issues....You can also set the MIDI editor to display drum notes as triangles or diamonds (not indicating the length).
If there's a specific chore involved in your workflow, you could try getting someone to write a script to do it automatically.
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