Built-in Compare Fields

Hi,
We have more than 300 attribute and want to add all of them to compare table.
Woodmart has drag&drop feature in compare option for adding fields, but in our case having some problem with it:
1. When we try to add new field from disabled to enabled, it take a long time for that due to large amount of fields!
2. We did that (adding all field) by editing hidden inputs, but another problem is that “Disabled” column gone and now we want to disable a field and there is no “Disabled” column to drag a field to it!!! (see attachment)
3. When we try adding fields from Disabled to Enabled, we need to respect order of fields. So we have to add them by specific order and adding field at bottom of column. But the problem is the bottom of column is not visible. When drag a field to bottom of column that larger than other, the page not scrolling.
4. When we try to change the order of fields, we have same problem. For example when we try move a field from bottom to top of column, the page not scrolling.

I think simple checkbox with drag&drop feature in this section is better idea for large amount of fields.

Thanks.