[feature request] symbol replacement

[feadraug]

Hi. Some OS (windows) does not support some symbols in filenames, like : " = * ? etc. Is is possible to add an option to automatically replacement of thos symbols for some i defined before i can paste them. For example, i need to save some files from web, but filenames are strange, and must be manually corrected. That is why i requested this. Thx for perfekt app!