Discontinued. Please do not ask for new features or updates.
Convenient Recipes adds in new recipes for previously uncraftable things, such as horse armour, saddles, name tags, packed ice and chainmail armour. It also allows players to remove colour from stained clay and glass, turn wool into string, convert hardened clay into bricks, and turn glass panes back into blocks. On top of all of that, recipes for walls, fences and stairs have a higher output to ensure geometrical correctness (and make them cheaper).
If you have any suggestions for more recipes, feel free to suggest away. Also feel free to suggest ideas for mods I could create.
You are basically talking about a mod which allows you to create and modify your own recipes. There isn't currently a way of doing this using Convenient Recipes, and I don't really plan to go very far with this mod. I think there are other mods that already do what you propose for 1.7.10 which will likely be updated soon. Sorry.
I've been considering this. I might make it so that you can place a piece of gravel and a piece of stone together to get flint so that it's not too overpowered. After all, the point of flint is that it is a bit harder to get. Good idea, though.