The already implemented feature of viewing and editing the memory of other processes guides me to an similar feature:
Reading (and may be writing) the \Device\PhysicalMemory. It can be done by using CreateFile() similar to accessing HDD-discs and volumes.
I know the is a very special feature but it should be easy to implement and with a little warning it can be IMHO be considered as "safe".
BTW: This feature is only available under NT, 2000, XP and W2K3 with Sp1 and less. W2K3 SP2 and Vista do not allow even to read the physical memory.
Wont add: HxD: Accessing \Device\PhysicalMemory
Re: HxD: Accessing \Device\PhysicalMemory
I should say that since support for accessing physical memory is gone since Vista+ I will not add this feature to HxD.