Should there be a warning for capturing "NEC" signals?

[bengtmartensson]

Background: IrpTransmogrifier (and IrScrutinizer, and many others, like DecodeIR) denotes a NEC-type signal without repeat as "NEC" and considers it as likely a bad learn, that cannot be used for rendering. Most learns of "NEC" are simply bad learns of NEC1, where the repeat was somehow missed.

It occurs pretty often that a user captures signals as "NEC", which is, by above, not useful for export or rendering. This can be quite confusing for a less experienced user. So the idea is to issue a warning the user, for example when pressing the export button, something like

At least one of your captured signals have protocol "NEC",
which probably means that the command was incompletely captured.
 It is likely that the correct protocol should instead be "NEC1". You may try, e.g. either
1. Re-capture the NEC signals (possibly pressing the keys for somewhat longer), or
2. Manually change the protocol to NEC1 (or NEC2, if appropriate).

There should be a "never show this again" checkbox.

Opinions? Or would it be better to warn as soon as a "NEC" signal has been recorded?