I've never had beeswax long enough to know how it burns when it is really old like that. You might also try hand-dipping the wick into a jar of the melted beeswax to make tapers. This avoids the use of a mold and should be no problem unless you simply can't get the wax to melt nicely. If the above does not work well, try blending your old beeswax with some new stuff to see if that works. Beeswax has traditionally been used as a lubricant on wood screws.
Seamstresses use it with needles, too.
I looked at beeswax sheets at our local craft store, but many had smashed or broken areas. As far as crushed sheets go, they are not totally worthless they are still beeswax. You can make the most out of them by rolling the damaged parts to the inside of your candles. Only the last wrap is visible, so technically that is the only layer that needs to stay pretty. I suppose one could press the wax back into shape, but depending on the size of the crushed area, this could be tedious.