Edit: all these different oods are sometimes very strange and difficult to me. I just learned to use HSFX modded systems but this UP3 is a new. For ex. when the game starts it is different looking in UP3 SAS mode as in HSFX mode...
Yep, UP3 looks different in Unlock FMB mode than regular FMB, in your case HSFX.
It looks more simplified so to say. But for changing textures, working on heights, adding roads, etc. it works great.
There is also a command to quickly change textures instead of pressing 'Insert' all the time. It was pressing a key (but which one?) and mouse button and moving the cursor over the map.
Like Cyberolas said Control C and Control V for copy-pasting groups of objecst. Or right mouse button and select Cut/Copy/Copy All/Paste from the dropdown menu.
Don't forget to check 'Enable Selected' and 'Rotate Objects' in 'Edit' (top left of your screen). Otherwise just one objects rotates
Also adding objects works differently in UP than HSFX. It is categorized in another way. I can not work with it. So when adding objects I go to normal FMB (I have DBW1.71) and add all the stuff I want and save it as a mission. Than I use Zuti's Actor's Management and paste whole [Buildings] section of that mission into the extracted actors.static.