UserPatch 1.5 new flags for custom mod installers

Hi, Pulkit from the ToME mod here. I have just updated the mod to use UP 1.5 from the previous 1.4. We use the silent command line installer to create a custom exe for the ToME mod. Previously in 1.4, we could use the feature flags with SetupAoC.exe -i -g:tome -f:11111001000000000000 and these binary 0/1 flags would line up perfectly with the list of features in the UP gui installer.

Now, UP 1.5 does not have any clear alignment between the flags listed in the UP website and what's visible in the gui installer. The example given on the UP website is -f:22211000110000. What is the meaning of 2 here? And with the UP installer being split into pages, how do the feature flags line up in this string?

Hoping to reach out to the authors of the UP installer or anyone with experience here.