We don’t have a date yet for barrel aging specific features but it is something that we fully plan to add to Breww (and before too long). You could use delayed racking releases, but that would mean moving the beer from the “vessel” to “containers”, and at we’ve not yet built Empty containers into a vessel to allow blending two different packaged products to make a new beer, so depending on what you plan to do with the beer you might not want to take it out of the vessel just yet. If these features would be useful for you, please can you vote for them?
If you’d like to keep the beer in your current barrel-ageing vessels but exclude them from the pre-brew stock check, you should be able to do this. If you go to the batch, and then to the “Brewing” page and go through each outstanding item and tick the box to mark them as complete, this will prevent the pre-brew stock check from thinking this stock is still needed (even if the batch is still open and the stock hasn’t actually be added).
I hope this makes sense, but please let us know if you have any questions on this.