Arcadyan KVD21 Gateway slow download speed

I started with TMHI about 2 weeks ago with a KVD21. I have a few issues I'd like to see solved, but on the whole, it's worked well and has been reliable.

The first issue, as noted above, is that there is little by way of an interface into the KVD21. DHCP, NAT, etc. are unavailable to the end user. 

The second issue is that my iPhone can connect via 5G with 2 bars just about anywhere in my home (I live in S. Florida) but not the gateway. It defaults to an LTE connection. That speed is fast enough for me to use the TMHI service, but it sure would be better with 5G speeds.

The last issue is there is no external antenna option. For people with questionable signal strength of 5G, an external antenna might be just the solution they need. Unfortunately, there is no provision for that with the KVD21.

Also, I notice speed differences at different times of the day. Weekdays are the slowest, evenings are the best. I hope that they'll upgrade the 5G tower near me soon so I can have the gateway connect to it. I think the interface of the KVD21 would be improved if it showed ALL networks that the gateway sees and give you a choice to either connect to one or the other. This would mimic the interface you have on your iPhone when connecting to WiFi.