In Aus there is an allowance for hot refueling, haven't got it in front of me but I think its CAO 20.11
I am pretty sure it has to written up in the Ops Manual as well. I daresay private operators can do what they please.
Its something like.
1 Pilot has to remain at controls
2 2 x fire extinguishers at the ready
3 measured amount of fuel
4 all radios off
I have seen a lot of hotrefueling in the bush from drum stock and I reckon the last place I would want to be is strapped into the front.
We used to hear of an occasional Bell 47 and Hughes 300 catching fire while hot refueling years ago but I have never heard of it happening to a Robinson R22, grass fire yes but from hot refueling no.