Any chance of getting a quick "Peek/Poke" option, maybe under the Debug pull-down menu and with a hot-key? A peek would give both byte and word results for an entered memory location, and the poke would change the entered memory location to an entered value (and do a DPOKE if value is over 255 integer or specified $xxxx hex). A peek address specified as hex($ prefix) would yield hex results, otherwise integer. A poke address/value is integer unless specified as hex with $ prefix. I'm sure this would be easy to implement.
I can see a small window titled "Peek/Poke" pop up with two input lines, one labeled "Address", and the other labeled "Value". A push-down button underneath(like the update button on the Cheater) would be labeled "Peek/Poke". When pressed, if an entry has been made on the value line, it must be a POKE, if not, it's a Peek and the results(byte, word) will be printed on the value line. Obviously an address has to be entered or no action taken.
Currently, as far as I know, I have to drop into the Debugger or Cheater to modify a memory location. Having a quicker way sure would be nice, especially if I'm playing a game and know the memory location where number of lives is stored and such or I just feel like changing the color of the Atari screen real quick by poking location 710($2C6), etc.