[virtual-signal=signal-anything] not grouped with planets
Honestly, I'd rather just remove [virtual-signal=signal-anything]. It exists only because Factorio had a harsh size limit for a section name. It is possible to recreate the behavior of [virtual-signal=signal-anything] by just using more icons.
[planet=nauvis] [virtual-signal=right-arrow] [planet=vulcanus][planet=gleba]
This should work as expected RN. The platform would only import from Nauvis and export to all other planets.
Making platform export only to Vulcanus and Gleba might be possible by listing the whole platform inventory in a request section, but I don't see why that would be useful. Since player can control where platform goes using schedule anyway.
More complex solutions like, say, "imports from Nauvis only go to Gleba" and "imports from Gleba only go to Vulcanus" I think can be theoretically done, but practically would require too much effort for little benefit. Might be a cool idea for some other LTN-like mod for platforms though.
[virtual-signal=signal-anything] [virtual-signal=right-arrow] [planet=nauvis][planet=gleba]
This should be equivalent to just [virtual-signal=signal-anything] [planet=nauvis] [planet=gleba], which the mod currently supports (I hope).
Mark rule as ignored
If "Strict group name pattern" setting is on - any symbol (besides spaces and punctuation) in front of icons in the section name would prevent mod from messing with the section. I think any icon besides the ones mod understands should also work. Adding a special way to disable processing of the section would just complicate things IMO.
Require additional icon for enabling auto-management
It adds a bit more busywork for the player, which is something I want to avoid. opt-in behavior would generally be preferable, but the mod was kind of supposed to be a small utility to save a few clicks setting planet filters. So I think opt-out is fine here.
