This is SPOT ON! It's called a hypothecation clause and allows holdings in a margin account to be usedby the firm. Only way to avoid lending is by moving the shares to a cash account.
BTW, placing a sell order far from the market does NOTHING to prevent yojr firm from borrowing the shares.
Last, some firms will share the margin interest with you. You must meet their account minimums and the interest rate I've received on some stocks has been huge because they pay on the market value of the shares' value. Fidelity, IB and Schwab all offer this. TD unfortunately doesn't.