SharedVision VS dragonflagon-fvtt

Yeah Shared Vision should be what you're looking for. Here's an excerpt on the functionality from the modules github page:

Perfect Vision is not the one you're looking for. Try Shared Vision

Shared Vision

Since you're using the Shared Vision module, this sounds like a bug within the module. The default behavior of Foundry is to show only what a token can see when it's selected and show everything you have permission to when deselected. The fact that the vision is retained but the token disappears sounds like a bug. You should probably create a bug report on the module's development page.

Shared Vision, which does exactly what you seem to want. You can use this to link up the vision of all player-tokens so they'll all be able to see together.

The module 'FoundryHotSeatObserver' seem not be mantained anymore, i can suggest this module for sharing the vision https://github.com/CDeenen/SharedVision

In the meantime I'd suggest using DF Architect and DF Curvy Walls to make your life easier. There aren't many maps I've seen which can't have their walls draw manually in a few minutes.

DragonFlagon Curvy Walls - tools for drawing curved walls

Dungeondraft is going to be better for creating full maps. Foundry isn't awful for creating maps, particularly with the right modules - the DragonFlagon ones like Architect and Curvy Walls are great, so is Dungeon Draw for on-the-fly stuff - but at the end of the day, map-making softwares are better for making maps to then export to Foundry for use.

Also, DF Hotkeys should let you rebind many (most?) keys that are already registered in Foundry.

DF Manual Rolls: Allows toggleable behavior for requesting manual rolls, inserting that value into regular roll actions

This is a known issue. Unfortunately I haven't had the spare time to get through my back-log of issues yet. But you can keep an eye on this ticket: https://github.com/flamewave000/dragonflagon-fvtt/issues/297

DragonFlagon Active Lights

DF Chat Enhancements has capabilities for logging in addition to other things, and it does a really good job.

DragonFlagon Chat Enhancements https://github.com/flamewave000/dragonflagon-fvtt/tree/master/df-chat-enhance I'm mostly using this mod for the ability to edit chat messages. The idea is that players would use this to state their actions, and then be able to change their mind later if someone else does something unexpected, or does something that would cause the original actions to "fizzle".