Maybe this is so strange and negligible but I have problem with this :

In many IDEs and Editors TAB character is equal to 4 spaces but in codeforces submission views it is equal to 8 spaces.

It isn't matter when you use it just for Indenting codes. but for more readability I keep comments in a vertical line with tab and sometimes use comments for visualize something in code and because of this problem they will be ruin in submission page so I must copy code in my editor again and view it.

VisualStudio and some other use of exactly 4 space characters instead of tab so this is ok also. but Notepad++ , Sublime , ... use of tab character itself.

Can you consider this? thanks for great works.