The basic radare distribution comes with two plugins to manipulate jumps (actually only x86) but wouldn't be hard to port it to ARM for example.
These ones are: nj and fj. They stand for 'Negate Jump' and 'Force Jump'.
Here's an example of use:
[0x465D8AB7]> :pd 1 0x465D8AB7 ^ jle 0x465D8AA3 [0x465D8AB7]> H nj 0x465D8AB7 ^ jg 0x465D8AA3 [0x465D8AB7]> H fj 0x465D8AB7 ^ jmp 0x465D8AA3