Carbonio UI: Shortcuts for selecting / deleting multiple emails

We switched from Zimbra to Carbonio recently. The feedback that we get from users is that selecting/deleting multiple mails doesn't work as nicely anymore:

• The Delete key does not work anymore. For example, users want to be able to delete three successive spam messages in a folder by pressing the Delete button on their keyboard three times. Instead, they have to switch into select mode, select the messages and then click delete. Thats 5 clicks instead of 3 simple key presses.
• Shift+Click to select multiple messages does not work anymore: Users want to be able to select a range of messages with Shift+Click on the first and last message of the range. Shift+Click should work at least in the select mode.

I know that there is the select mode, but this is too cumbersome because it supports only selecting individual messages and not ranges (similar to Ctrl+Click in many interfaces). If I need to delete 20 messages in a row, I have to klick 20 times and select each message!

There was a discussion on keybord shortcuts also here: https://community.zextras.com/forum/carbonio-general-thread/brief-feedback-on-the-use-of-carbonio-webmail/
Is there any progress? It would be nice to have at least the Delete key and Shift+Click options implemented soon.

Thanks,
Marco