We have data for +/-5V and + 5V operating condition .
Do you have details of the Spec details when used at +12 V .
With best regards and wishes
We have only characterized AD8099 for +5 and +/-5V supplies. All the characterization data that we have is already in the datasheet. The +5V supply table should give you an idea on the performance of part at a +12V supply.
Yes, you can connect the controller directly to the DISABLE pin as long as you set the proper supply voltage level (please see Table 5 of the datasheet). You can have an option to disable or enable the part or reduce the input bias current.
Let us know if you need anything else.