We have looked into the TapaTalk utility, and at this time integration with this App doesn't appear to be possible. We will add this feature request to our development plans for the site and as soon as the situation changes, I will be sure to come back to you.
If you are on the road (or in the air) and want to use HangarChat on your mobile device, I would suggest you use the mobile version of the site http://www.myhangarchat.com/m and you will be able to start new discussions and comment on existing forums.
If you have any other suggestions or feature requests, please let us know.