Nope... This is the v1 UI, not the "flexible UI" of v3+ viewers...
But for such purposes, I implemented Lua scripting.
Use Lua side bar buttons. It's just a few lines to write in your future automation.lua script. Refer to the
PDF manual (also available from the viewer "Help" menu, "Lua scripting help..." entry) for full features and examples. And yes, those buttons can use icons and UTF-8 characters (including emojis)...
No, but you may hide it, and instead enable the chat input line in the chat history floater (see the "Preferences" floater, "Cool features" tab, "User interface" sub-tab, and do read the too tips there !). You could also create a Lua chat bar floater... Linux users can even use the dbuschat.tk Tcl/Tk script I provide (part of the installed files) for an independent chat window. Possibilities are endless...
In v1 viewers we have the landmark combo in the World map, and I implemented a "Teleport history" floater with a preferred tab too, which auto-updates with your number of visits... You can of course use a Lua button to open that floater. And you can easily create a Lua inventory landmarks floater (examples of such inventory Lua floaters already exist in this forum: use the "Search" feature !).
Easily done in Lua... There are also debug settings (CTRL ALT S) for the most exotic camera parameters that are not listed in the "Preferences" floater, "Input & camera" tab, "Camera" sub-tab (I assume you found those...). Finally, you can use the "Front camera" for some other angles if you don't need it: it can be toggled easily from the "Movement controls" mini-floater (with the "Front" check box).
One advice: before asking for help, do explore the many settings offered in the Preferences floater, the menus (and the Advanced menu), or even the debug settings... This forum is in itself worth a Wiki, with already hundreds of questions answered: use "Search", please, before posting...