Well thats all very subjective isn't it? One mans gadget is another man's useful inclusion. I can't say I'd find a Socket for Fire drill that useful but I guess I'm imagining a firesteel being included somehow.
Obviously certain features on knives are a subjective step to far where they actually weaken the knife or become unusable in reality , however the inclusion of 'pragmatic useful' ( again I know subjective ) of additions to dead metal space I see as potentially useful - example would be Duncans ( Dorset Woodland Blades ) inclusion of a Hex bit holder as one of the more usefull additions.
A less useful addition that has just come to mind would be to me the screw driver heads on the handguard of the First Blood Knife. To me there is just more chance of me wrecking my knuckle upon it.
https://www.google.co.uk/search?q=f...UICCgC&biw=1482&bih=803#imgrc=gUjRIMZdayv8HM:
Funny thing is I made a few bushtools with the centre hole as a hex holder, I used the first blood knife with the screwdriver cross guard and yes it dug right into my hand , pretty awful idea.
In my opinion an awl similar to the ones on Swiss army knives would be a good inclusion some where on the sheath but I can't imagine it on the actual knife.
The bowdrill divot is good on the Tops BOB and similar mid size utility knives but on a razor sharp scandi bushy it could prove dangerous unless the knife is sheathed and most of them are deep leather so not practical.