Hey Erel,
I contacted the vendor (Actipro) just to see if they had any ETA of adding this support, and they said they have no idea at this time, but suggested that I (the user of there IDE component) could implement it myself.
So, since you already wrote a routine that can search across all modules (quick search), I'm hoping it wouldn't be to difficult to modify the find/replace routing to also span across all documents/modules. What do you think?