Nothing wrong with that,
I think the mallion is used because in many an self rescue situation - the footloop and leash section of rope becomes a handy bit of kit - (counter balances for getting unconsious victims off the rope or getting slack in the system for hauling, tied to make a sling etc etc.) By having it on a mallion, its easier to remove it from your D should you need to.
When the Eldon went on one of Nigel Atkins Advanced SRT and Self rescue days, the first hour practiacally was spent discussing :argue: about our SRT rigs. Everybody has a slightly different set up. Nobody's was wrong particularly, but what nigel was trying to do was to get everybody to think about WHY their set up was so.
i.e.
Why do I put my rack on the left of my croll - because it doesnt interfere with the cam on the croll.
Why do i use a D not a Delta.
Why do I have my jammer leash on a mallion.
Why do I use steel D instead of alloy.
So long as everybody has thought about why you do these things, and can come up with valid answers - then fine, what ever works for you. 8)
Chest straps are an interesting one, many people I know use bungee, from their harness - over their shoulders to the croll - quick - easy and it works. I use a strap however for the one reason that if Im rendered unconsious whilst jugging, by using a strap - I'll remain upright. (you dont with bungee - I tried it).
It just takes a few seconds more to thread it each time I have to take it on/off.