Beginners rigging question...
If you wish to run a topping lift I don''t see any reason why you can''t. The lift is controlled at the mast not the end of the boom. I used to own a 23''er and had that puppy rigged like a 40''er which I now have. Made solo sailing a breeze. I couldn''t afford roller furling so I made a jib downhaul for getting the jib down in a hurry. I might add here that all running rigging on the 23''3r were run aft to the cockpit, halyards, reefing lines, etc. That might be overkill on a 15''er. I''m for anything that makes sailing less work and more fun so try whatever you think works for you. If it doesn''t work as planned try something else. The thing you''ll discover is 15 sailors have 15 opinions, some good, some bad. You have to decide what''s good for you and your boat, be inventive, nothing ventured, nothing gained or learned.
Best of luck.