Describe the request
Make sure to include:

1. What problem or issue would this enhancement solve?
   Ability to knapp with two different kinds of rock, one in your main hand and one in your off hand, the one in your main hand would be the rock that gets consumed in the process.
   A config to toggle whether two handed knapping is required would also be great. (similarly to off-handed hammers + chisels.)

Meta Info

• TFC Version: 29.5.120 (at time of request)
• Is this a compatibility feature for other mods? Or a enhancement for TFC alone?
  TFC.
• If necessary, what other mods (including versions) would this require?
  Nah.