Shoutbox

The current search dialog of Messenger Plus! itself, in the Log Viewer, has much more functionality than the one from chat windows, even when searching a single chat log.
Thus, replacing the one from the Log Viewer with this one means removing a lot of functionality.
As such, I highly doubt this will be done.

I don't mean removing that - I stated how useful it is when conducting a large search. What I meant was that instead of using Windows' version of it when using ctrl + F, why not just use the same one that is used when you press ctrl + F in a chat window?

At the very least, how about a choice to the user to either use Windows' one or the one that pops up within a chat window?

Win-win IMO, especially when I say that I don't mind coding it myself.