What I want as a mixed mode user (due to RSI I have to use this mode for pain management):

1. Coming from from expanded LT+RT having a predictable result that doesn't require extremely precise timing. IE:
I'm on RT (mixed mode is a toggle mode), I use RT+LT or LT+RT to press a button on my expanded bars (expanded bar access is a trigger hold mode), when I release in either trigger order I want to go back to RT or into no trigger held at all, not have it random depending on what I released first in which milisecond.

2. A way to 'lock' my target, when I end up in no trigger held I will sometimes press up thinking I'm on either RT or LT, I am now the soft target and have to use a macro to clear it, terrible.
I pressed B, I now lost my target.
I pressed X, I now have my context menu open.
I pressed B, didn't notice and pressed X, my map is now open!