You actually can...
You need to go to the "Club Points - Search and Book Reservations" from Dashboard. Then when you search from reservations you will see availability even if you do not have sufficient points to book.
For example, if I want a 1BR Oceanfront at Ocean Pointe in November for 6 nights, this is what I see (unit size and view configurable on right side). Al the "white" dates are available for that unit/view type.
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If I click on a "white" (available) date (e.g., Nov 25), I then get a message that I don't have enough points:
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