So far I have not done anything, as I preferred to see what developed in this thread and hear what RRM wanted done.
Once there is a decision I will be happy to take care of it.
Personally I prefer not to install too many modifications (a few are okay), as it makes upgrading the board harder.
For me, "keep unread flags" is the only mod I would find really helpful. The attachment mod sounds nice to have, but so far I didn't really miss that possibility (sorry Gavi ).
Apparently the 'new' tags are also related to one IP-address at the moment. It seems that checking under 2 different accounts still gets rid of the tags for both.