Cook spaghetti following package directions.
Meanwhile, heat oil in large skillet over medium-high heat. Add onion and red pepper; cook 3 minutes. Add broccoli and garlic; cook, stirring occasionally, 5 minutes or until tender.
Heat half-and-half and butter in small saucepan until butter is melted. Stir in cheese, salt and hot-pepper sauce.
Add cream mixture and crabmeat to skillet. Heat through over medium heat. Toss with cooked, drained pasta in large bowl. Garnish with lemon.