Parshift: It'll primarily be because it's doing the processing a file at a time instead of multiple files at the same time. When I first got the feature re-implemented, I only did the single file at a time method just to help verify that the processing was correct & not causing issues (which it did for a bit until that was resolved).
I've not come back around to working on the plug-in to finish off the multiple file processing which is why we've got the slow but stable approach still. It will hopefully get some love later this year to bring it up to the expected level of processing multiple files.
CodeLurker:Thus, I strongly recommend allowing Replay Gain to be edited, and to at least be open-minded about alternate loudness measures.
I thought I had been open minded in providing the 2 common methods that other players are using so a) I maintain compatibility for those needing it whilst b) adopting what from my research has been deemed the more appropriate solution to use. If there are other options that a decent majority are using then I'm open to trying to add support for them, subject to code & licensing related to it.
With regards to manually editing of the values, its not been done yet as not all of the input plug-ins that are responsible for handling such matters have been replaced &/or modified to make it viable to generically edit that metadata. Once that's done then the singular & batch edit dialogs will get the support added to them.
I know most just see it is disabled edit controls but to have things done consistently (which has been an issue with Winamp not doing that) then there's a few pieces that need to be sorted out which is part of my end goals to have key tagging functionality somewhat isolated from the input plug-ins so things can be done to it without having to update half a dozen plug-ins &/or the duplicated code that comes from some of them using the same tagging format (e.g. ogg vorbis + flac plug-ins).
-dro