Maybe your better off using a rocket launcher or grenade as a basis for melee attacks.
These use physics, so you could theoretically have more realistic whacks, and they never rapid fire. You can also change the speed of the missile and it's trajectory, so you have more control over the timing and placement of the hit.
There's no point complaining because somebody else hasn't worked this out yet. You'll just have to keep at it, or wait.
Some of the things I've done in FPSC have taken me ages to test properly.
I'm working on a melee system, but it has a low priority for me and may never make my final game.
instinct is more valuable than intelligence.....