Edit, Merge layer command

[nevw]

I find the Edit, 'Merge layer' command on the main menu to be quite dangerous as there is no undo for the merge actions that I know of. I have by mistake selected the 'merge layer' instead of 'merge selected' a couple of times and had to abort the session with much editing lost. Recovering from a mistake in 'Merge selected' is generally a simple task but recovering from 'Merge layer' is mostly a disaster as the layer is likely to be a large amount of data.
I would like an extra step added added to the 'Merge layer' button to warn if you really meant to merge the layer and that this command can't be undone. I suppose the text on the button would to be changed from 'Merge layer' to 'Merge layer...' too.