1.
In the manual it states the following:

4.3. Connector “Fan 1/2/3/4”
Voltage regulated fan outputs with speed signal processing. aquaero 5:
Maximum output power is 19.8 W (1.65 A at 12 V) for each channel. Maximum power is dynamically limited through temperature monitoring and will decrease considerably at lower output voltages. In case an output amplifier temperature rises to ca. 95 °C, the output is set to 100 % power. After cool- ing down to ca. 70 °C, normal operation will resume. If the temperature ris- es to ca. 100 °C, the output will be permanently disabled. To reactivate the output, the aquaero (or the complete PC) has to be disconnected from power for a short period of time. Despite this overload protection, the fan outputs are not short-circuit proof!

So look at the fan specs and see what can be done.

EDIT: If these are your fans, with an amp draw of 0.18A per fan, then the 0.36A draw for both is well within the operating specification for the aquaero at1.65A per channel. So yes, you should be able to drive both on one port.

2.
If you click on the system tab under the aquaero, you will see your current firmware version, and the version it is able to update to.
This part I am not 100% clear on, but I believe if they are the same, then you have the latest version installed. - hopefully someone will correct me if I am wrong.


3.
I believe while in the edit mode for the display page you can right click on the text and select delete.

4.
The pump power will come from your PC Power Supply. The aquabus connector is for control & monitoring. Both should be connected.

5.
I don't think aquasuite has the ability to send data to the Logitech G13 display, BUT AIDA64 has been implementing the ability to drive many LCD displays, and I believe the G13 is one of them. AIDA64 reads aquasuite's data and can then display that data to your G13. Check at AIDA64.