Hi, John 

Thanks for reaching out to us

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1. Thank you for the suggestion about the Timestamp, i will pass it to our developers as suggestion for future improvement.

I will pass this to them, but please feel free to search on this page, 

 to see if someone may be already suggested this feature. If you can't see it, feel free to add your suggestion there, and it will be forwarded to our management for review.

After it's been reviewed it will be presented on the front page, for voting. Please note that it may take some time before your suggestion is brought up for voting since we receive quite a lot of suggestions on daily basis, and as more people vote, the feature will move higher on the priority list.

You can certainly follow our changeLog page if you'd like, where we state any changes/new features/bug fixes during updates;

and our newsletter, so you're informed about new features, bug fixes, freebies, etc.

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2.

Regarding the attachment column, we already have this.

For these columns, in the editor input type, you have to set as "attachment"

Please check more details on all editor types available here.

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Applicable column types: on the wpDataTables side – URL link and Image; on the MySQL side, VARCHAR, or TEXT.

Issues to note:

• If the Column type is set to Image, the uploader will automatically insert a ‘thumb’ size in the table cell (the resolution is defined in WP config), and link it to a full-size image. If you have a WP Lightbox 2 plugin installed, each image will automatically open in a lightbox,
• Since wpDataTables is using the native WP Media Library for uploading and managing files, the standard WP restrictions apply. This means that front-end users that edit the table must have the upload_files capability to be able to upload attachments. You can add this capability to Subscribers if needed (e.g. with Capability Manager Enhanced or User Role Editor plugin). If you want to allow uploads for non-logged-in users, you will need to remove the check for this capability (see our FAQ).
• Files should be with extensions WP allows.
• Files shouldn’t be bigger than the current PHP configuration allows.

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More details about how to allow my front-end users to upload attachments in front-end uploader here.

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Let me know if you have any questions. Thank you