"Welcome back!". I'll try to help...
Since you have an FLX, the Output window has a Preview button. To see fixture details (colour, gobo etc) you'll have to select them first and then you'll get a scrollable list. (Might not be quite as good as you have on Eos).
SmartTag looks for non-zero intensity then records only the attributes/parameters that are adjusted in the programmer and are thus required to be recorded to recreate that look. Whether it is attribute or parameter depends on the attribute. For example by default, Colour parameters are linked together (so you get the colour you want) whereas Shape and Beam parameters are not grouped (gobo is not linked with zoom for example). If you turn SmartTag off then tagging will be based on what you adjusted but the "linking" will be as above. You can change this in Setup.
To untag a whole fixture, select it then (I think) it's CLEAR+HOME (need to check the manual!). To untag a whole attribute it's CLEAR+COLOUR (for example)
Select the Fixture, hit HOME (this will tag all parameters). UPDATE and select the REMOVE option. (See David's elaboration in the following post).
Palettes recorded on a fixture can be applied to another fixture of the exact same type even if that other fixture wasn't selected when recorded. There isn't currently any other "palette morphing" onto a fixture with similar capabilities but a different make/model. (This is something I/we've been asking for for some time, so I hope it will come along soon... 😉 )
No you won't do it by accident. You have to try "quite hard" to get anything but Colour in a Colour palette (but actually you can record Beam/Shape etc in there but you have to be very explicit to do that). The most (in my usage) application of this is to be very specific about which attributes are recorded into an Effect palette.
I'm not sure you can do that. Using the "spreadsheet" style of the cue list one by one is the only method I know. You can however in Setup, set the default times for fades, so if during programming you need different times for a block of cues you could do this. But once you've programmed, I don't know a quicker way to update them.
There is reasonable COPY (and MOVE) functionality (especially on FLX), but I don't know that you can do this.
I hope that helps!
I'd encourage you to put enhancement requests in on this forum for any features you have in Eos that would be beneficial on ZerOS.
To record a blackout, I recommend "1 THRU *. <ENTER>" as this allows move on dark to continue to work. Similarly, avoid snapshot cues Similarly if you get white boxes in your output windows, those fixtures have "blocked" values. If this is not intended, then use UPDATE <ENTER> (with SmartTag enabled) to remove these. Note also when you're using UPDATE to ensure you've selected the tracking option you want - Cue Only, Track Forward etc (those are probably the options you're most likely to use). Tracking works well on FLX so I'd encourage you to stay in that mode, and not go back to Global Cue Only mode (in Setup).