Hi, (in my moderator’s ‘hat’) the general convention here is this is a user-to-user forum so suggestions made here aren’t being made to Eastgate but rather to fellow users. However, Eastgate does post here and sometimes suggestions are taken forward from user posts. However, that shouldn’t be assumed to always be the case. If you genuinely wish to see a new feature it is worthwhile writing to Tinderbox support (email@example.com) making your case - with an explanatory use case if needed. So, if a fellow user here suggests you mail in a request, they aren’t being unfriendly but simply pointing you at the right channel.
In the same context it is worth noting that this forum is not Tinderbox support. For real problems, show-stoppers, etc. email support at firstname.lastname@example.org as that will generally get you faster response. Your fellow users are a better resource for the ‘how to’ aspect of things or where to find features, as we’ve no visibility under the hood of the app (thus sometimes you may get suggested to write to support instead).
I think the issue of shared window focus can now be regarded as a known issue. Quite, how/if it may change I can’t say but I likely doesn’t need raising as a new issue. Note: the v6+ app re-write uses a single window UI metaphor, in no small part because there was vocal demand for that (not least, it seems to be the current style of Mac apps). Multiple window support was added later though they currently share a single selection, courtesy of the original design. I suspect making (2 or more) windows ‘stand-alone’ in selection terms may have unseen complications so whilst desirable, it may not be sitting at the top of the to do stack. HTH.