Qs re SystemNotifications dev plans

[valan]

to @Ryan and dev team.

It has happened that I've started development of notification system for users and found that there is already SystemNotifications module and related classes in core. Before development of own bicycle I've decided to check if it is required) and/or use a chance to add few wishes at moment when this module is under development.

Please could you share thoughts/plans on the following:

1. currently flags in Notification are protected static. It limits possibilities to extend class by adding custom flags and handlers for these flags in FieldtypeNotifications. For example, notification flags for SMS or messengers, like Telegram. They can (and probably should) be handled in FieldtypeNotifications in the same manner as emails. At my site I use both SMS and Telegram notifications. Also, I think preferred notification methods should be set by (or for) user.

2. emails (as well as other "contacts" like cellphone number for SMS, etc) could be taken from different user fields, depending on some condition. In my system for example, sales managers roles need to get internal emails to corporate emails while being users, they get emails from system email field. E.g. "contact fields" should be customizable and/or hookable.

3. currently notifications are removed as soon as user closes them. There could be notifications that require action(s) (e.g. changes at some page); while these actions are not performed, notification should remain. E.g. it is some form of "todo" notification controlled by the system. Also there could be actions which can not be controlled by system, e.g. user should either confirm "done" or "cancel" or "postpone" them manually. Do you consider such "to-do" notifications as something that should be developed separately OR you think that they may be realized in the scope of SystemNotifications? 

4. currently at UI level notifications are injected through predefined core js/css and predefined admin DOM structure. This limits possibilities to make notifications UI different. For example, I'd prefer to give my users "Facebook style" icon & attached notifications menu. Is it possible to leave hooks and/or module config params that opens a space for js/css replacement/adjustment and possibly more admin DOM extras (like adding menu items)?

Thank you!