Since 1.6 and the new launcher and how it works, you are unable to edit base classes in a mod. Now this leads me to a problem. How would I do this? Let's say I want to make flint and steel be able to stack up to 64, how would I do this without editing the base class of flint and steel? Thank you.

IF you edit base classes directly then you will be incompitable with other mods.

quite rapidly you will be incompitable with everything which makes me wonder why you use forge at all

 

If you want to be compitable with other mods I recommend that you read up on core mods and ASM, it's an advance topic so make sure you are far beyond the basics of Java and OOP before starting!

http://www.minecraftforum.net/topic/1854988-tutorial-162-changing-vanilla-without-editing-base-classes-coremods-and-events-very-advanced/

Thank you for the link, I will start my jump into leraning how to make a coremod, however before I do is it possible to edit a base class indirectly?

thats what asm is doing

Ok Thank you for replying. This answered my question. Time to start learning

Thank you for the link, I will start my jump into leraning how to make a coremod, however before I do is it possible to edit a base class indirectly?

 

Yes, there's a way to do it, the same way forge did it for example.

You could also skip forge entierly, but unless you do it the same way as forge did (which means you might as well use forge lolz) you will get problems with compatability as well as possible legal issues when distibuting your mod.

 

Can you override stock recipes so that, for example, the Flint and Steel recipe returns a new, modded in version that's stackable?

You can do that without editing base classes. Add your recipe and it will probably be used instead of the old one.

^what gotolink said. and not just for the recipes. stack sizes can be changed without asm as well