Hello,
Glad that this fixed it. I will have to see if somehow this fix can be incorporated in a future patch.
1. I cannot see how this fix would negatively affect anything else.
2. The plugin maintains for each user and coin one “current” address that is displayed, and a number of “old” addresses that are retained so that if a user attempts to send funds to an old address, the funds can still get credited to that user. If you have no need for these addresses then you can delete them. Clicking on “Renew deposit addresses” under a coin in the adapters list marks all deposit addresses for that coin as “old”, and the plugin will next produce new “current” addresses. This is a way to make sure that the displayed deposit addresses are renewed.
3. I would recommend that you do not do any more changes.
4. No. See #2 above.