Some wikipedians would like to have an automatic detection of "questionable modifications". Questionable modifications, mean, modifications that have a great chance to be a rookie's test or a vandalism. This automatic detection may be done by check, for example:
We have discussed the same on the german language Wikipedia some time ago (we even collected those "keyboard tests" to do a (visual) pattern analysis) and in the end, the idea was dropped more or less: Most of the vandalism edits in existing articles don't follow that behaviour, and new articles are checked anyway "by hand" for formatting and so on. The percentange of "bad" edits that one could possibly find out with such a mechanism is so small, that it is unlikely to justify the programming effort.
Uli