In reply to 6b-east:
Completely unacceptable as aln points out. A good general principle of climbing is to leave the least in-situ gear in the rock at all, and never ever change exisiting routes without a full consultation with the climbing community and first ascentionist (i.e. simply don't).
An even better general principle is never try to bring a challenging route down to your level - always try to improve your level to be good enough to do the route. This also applies to leading routes like the ones you've mentioned, instead of wasting and disrespecting them by top-roping them.
In short, aspire to a good climbing style.