You definitely want to put in all the low band frequencies for Nassau that are located in the RRDB under "FIRE". You will also want to put in the cross band repeaters.
Since your location is listed as "Syosset", 46.10 will allow you to hear what is happening just outside your community. A lot of the north shore towns still use 46.10, especially through the 1st, 5th, and 8th Battalions, where you neighbor. While some of the fireground operations are on department UHF frequencies, you will still hear plenty of activity on 46.12, 46.20, 46.22, and 46.32. That is also why I suggested adding the UHF Cross band repeaters in as well.
The list of departments in Nassau who no longer dispatch on 46.10 hasn't changed much in a few years, but there are a number of them that you won't hear down there unless they are making their Sunday Morning Radio Checks. Some departments will simulcast dispatching on 46.10 and their UHF Dispatch frequencies, while others will have firecom dispatch on 46.10, and their in-house dispatcher will repeat the call on the department's UHF dispatch frequency.