With that as background, our approach is just to explain why we won't work as transaction brokers, and one of the more direct ways we do that is to begin with section 6 of the "Exclusive Right to Buy Listing Contract" which reviews an abbreviated list of things that a buyer agent is required to do on behalf of the buyer and that a transaction broker really shouldn't be doing. If you explain that you'd rather not work with someone than to be put in a position where you can't promote the interests of the buyer, can try to help them negotiate price and terms that they want, and counsel them as to the material benefits or risks of the transaction, they sense your commitment to them.
The other thing we do...and have done since 1992...is add a clause to the agreement that gives them the right to terminate it at any time they want. We've had only a half dozen or so buyers terminate over those years...mostly because they just quit looking for property. In any case, this...combined with the intro in the prior paragraph...generally eliminates any discomfort with signing the buyer agency agreement. It communicates to them that we're signing this so that we can do the job right...and that doing the job right...not just getting a commission ...is what matters most to us.
It truly is the responsibility of any brokerage to ensure their agent's questions are answered and they are properly equipped to work one on one with clients. You are also entitled to receive this type of education when you hang your license somewhere.
My recommendation is to find training opportunities/classes offered that specifically deal with Working with Buyers and this will most certainly be addressed. Another option is to work with an experienced agent as a one-to-one mentor.
No disrespect meant in not being more helpful, but I come from the perspective of a regular trainer and mentor in our office and I know I'd be pained to find that our agents were going to agents outside of our Market Center on Trulia to get their questions answered. :)
Best of luck!
Keller Williams Avenues Realty LLC