Custom Mobile Phone designing is a narrow and possibly a very deep page.
I have always noticed that Fireworks has a limited canvas size even in CS6 (non-cloud version). This has not been a problem until now.
Photoshop seems to have this covered with at least a 10000px width and depth.
For mobile website design the canvas size needs to be extended if possible beyond 6200px.
Can this be done in the existing package or is it something that Adobe programmers need to address?
You can increase the built-in limit to 10.000px, but beyond that you may encounter issues.
I am thinking the lower limit was set intentionally to prevent certain issues, but here's hwo to do it:
Make sure that Fireworks is closed, open
Fireworks CS6 Preferences.txt file located in:
C:\Documents and Settings\USERNAME\AppData\Roaming\Adobe\Fireworks CS6\English\
Library/Preferences/Adobe Fireworks CS6/en/
or adjust this number as needed.