[FeatureRequest]: Timeout on M291return default value

[T3P3]

Is your feature request related to a problem? Please describe.

At present if you use a timeout value (Tnn), the result is to cancel the macro.

Describe the solution you propose.

I would like to request this be altered slightly such that if a default value is specified then that value be returned as the input after the timeout.
If no default is specified then the current cancel after timeout setup remain.

Example in forum post: https://forum.duet3d.com/topic/33152/timeout-on-m291return-default-value

Describe alternatives you've considered

Ex. A workaround exists but it is tedius, for example...

Provide any additional context or information.

Ex. Photos, mockups, etc.