The britannia logic changes don't actually fix any Lazarus content issues at this time, so any of the bugfix_*** dsres files should be fine to use. The same goes for any graphical mods. I know that some of the Grail Quest mods may conflict with newer britannia_logic builds, but since none of these have been tested to any degree, I can't say for sure. The recommended approach would be to run w/o mods and add additional ones to see if any break. If anyone has any experience with any of these other mods, or would like to work to get them to work under the latest britannia builds, feel free to comment either here or in the Lazarus modding forum.
As for the ";" key, it should be the same key that launches the karma window. The latest britannia logic removed the "Settings" button from this window and moved it to the in-game menu (accessed by ESC), but the karma window is still available with additional information about reagent counts. I noticed that the settings button does not show up in Lazarus yet, but will be restored when I release the next compatibility update.
I'm not sure what you mean by getting a ghost and stub after respawn. Could you explain in more detail?