I’m not fond of tricky soldering either, so I try to limit my modifications mostly to firmware. It’s much easier than soldering tiny parts into arrangements they weren’t intended for.
This current thread is definitely not the worst place to ask… Or there’s CRX’s thread for interface cheatsheets: Flashlight User Interface Cheatsheets
The repository’s INDEX file might also be useful, but it’s not the greatest. It’s just the contents of each project’s “meta” file reorganized and merged into one file, to make it easier to search for suitable projects.
In general, a lighted tailcap is kind of a pain on pretty much any light because it depends so much on finicky analog circuit behavior. Djozz or emarkd might have some good tips on doing those though, since they have done quite a few.
Or if you use an e-switch light, it’s easier to have a lighted button since the MCU can power and control it directly. But then it’s difficult to have the button in the tail. The FW3A does it, but it has no button light and it’s somehow still not out yet.