You are, of course, free to make any changes/additions you want to wxGlade, in whatever way you like.
If you decide to contribute them back, however, here are some simple (stylistic) rules to follow: note that these are only general indications, if you think they don't fit somewhere, feel free to ignore them.
Class names are usually CamelCase - variables, functions and method names are lower_case_with_unserscores
Constants are UPPER_CASE
Source lines are at most 79 characters long
Class bodies are usually ended by a “
end of class ClassName
Source files use Unix EOL conventions (LF) if possible. In any case, please don't mix Unix and Windows EOLs
Put your copyright info whenever appropriate