The best and simplest solution would be for HTC to simply use a slightly stronger spring in the kickstand so that it would fully support the phone in 'upside-down' landscape mode.
Even with the current weak spring, with the charging cable plugged into the top of the phone, it adds just enough extra support to allow the kickstand to support the phone in this manner.
In other words, plug in your stock charging cable, open the kickstand, place the phone in 'upside down' landscape position with the kickstand flush against a table. In this manner, you can charge the battery while you watch 2-hour long videos, without the multimedia dock. Problem solved.
Even with the current weak spring, with the charging cable plugged into the top of the phone, it adds just enough extra support to allow the kickstand to support the phone in this manner.
In other words, plug in your stock charging cable, open the kickstand, place the phone in 'upside down' landscape position with the kickstand flush against a table. In this manner, you can charge the battery while you watch 2-hour long videos, without the multimedia dock. Problem solved.