Adding a debounce capability to inputs

[twostar]

At the moment the KC868 inputs are instantaneous which is a problem for signals that glitch occasionally from things like noise coupled onto the input lines.  Would it be possible to add a debounce capability where you can specify that an input has to be asserted for x seconds, x user-settable, before it gets reported as an asserted input?  What I'm thinking of is adding a per-input capability where you can specify that it needs to be asserted for (say) 5 seconds before it's treated as valid.  The overall range would be maybe 0-60s, 0s = instant response, > 0s = input must be asserted for that long before it's reported as asserted.