1 - Follow and assist. I followed MiRai's video, and the posting in this forum, and it works fine, with just one hiccup. I have 3 chars, 2 of which are pet classes. When the non-pet char hits the assist hotkey, the other two target his target (exactly what I expect). When one of the pet classes uses the assist hotkey, the other two target his pet. If I hit the assist hotkey again, then they target his target.
This may combine with the EQ1 mechanic where pressing F2 (to target your party member) after already having him targeted, targets the pet as you've described. To avoid that, you could potentially add another Keystroke Action to the top of the "Follow Me" Mapped Key, to send ESC. This should cause them to clear their current target first, and therefore avoid this mechanic.
There's also an inherent delay in Assist, which could potentially be related (e.g. press it once and he has no target yet, so you might target him... press again, now it targets his pet).
To try out the ESC idea:
1. In the top left pane under Key Maps, select "Non-combat"
2. In the bottom left pane under Mapped Keys, expand Follow Me so under it you see Steps 1 and 2
3. Select Step 1, so to the right you should then see Actions, <Target Slot {SLOT}> -> all other
4. Right click "Actions" and under Keystroke Actions, select "New Keystroke Action"
5. To the right there's now a Target box and a Keystroke box. For the Target, select "Window:All w/o Current" (this is "all other"), and then for Key Combination click the < and make it ESC.
6. Right click your new Action and select Move Up (or alternatively, click it and press Alt+Up for the same thing)
7. Export to Inner Space, and see if it helps. If not, go back and delete it and we'll go back to the drawing board.
2 - I made a mount hotkey (keymap) which has all three cast their mounts at the same time. It works, except every time, one or two of the chars aren't on their mounts! They have the buff in their window, but they're not on the mount visually. They can walk away, and the mount stays where it was. I have to click off the buff, and cast the mount manually. And even then, the original (unoccupied) mount, stays there as long as I'm in the zone!
lol... very weird. This sounds like nothing more than a bug in the game, possibly a server-side "race condition" in spawning the mounts at the exact same time. You COULD change it to a Round-Robin and press the key quickly 3 times instead of 1 time, and this could potentially mitigate this problem.
The only thing that comes to mind as far as ISBoxer goes, and this should already be set for you, is the "Make game believe it is foreground window" check box in your Character Set. This has to be checked for EQ1 to respond to various broadcast keys/clicks, so I'm guessing it's already set.
3 - One time, after making hotkey mods in ISB and exporting to running EQ sessions, it screwed up my UI. I have the windows configured for 1600x900, 1 big and 2 small ones. After this reload, the windows were still 1600x900, but most of the UI windows were "below" where I could see them, as if it thought the window was 1600x1200. Reloading UI's didn't help, logging to char select and back didn't help. Exiting completely and logging back in fixed it. And it only did this for slots 2 and 3. Slot one was fine. And in numerous reloads before and since, it's never done this again.
Might it be possible that you changed some of the in-game Video Options that time? Or pressed Alt+Enter maybe? If so, the game could have adjusted the window, and then when you Export to Inner Space, ISBoxer is going to try to reset the Window Layout (adjusting that window again), and it might require a re-launch of that instance to correct everything. Otherwise nothing specific comes to mind