Tiny Tower Vegas – Is There a Player’s Club Leaderboard

No as mentioned in the other answer, you have to wait. My best advice is always keep one of the 5 slots open when you need workers, use level 9s when appropriate, and switch them out for the first dream job applicant you can. If you have a difference in points by 1 or 2 you can consider firing the first bitizen and taking a small decrease for a chip.

Not really worth it long term but it helps if that is your goal. If there is any increase in their performance you should instantly fire whoever holds the position for the more qualified applicant. I would take a level 0 dream versus a level 9 with a dream not befitting the employment I gave them.

No. The roof and the lobby being changed is solely for cosmetic purposes. According to Touch Arcade, there really isn't a boost of some sort for your tower. It's only for cosmetics.