MindArk replied to this many years ago when we asked for an assignable Officer of the Day role.
I can't remember the exact wording but the gist of it was that increasing the number of Guest List / Summon capable persons in effect increases the number of ships as it allows them to operate when owner not available. They felt there were already too many idle unused ships and that this would worsen the situation by making a few more active to the detriment of the less active ones. All it really does is make space harder for everyone.
Scheduled warp vessel owners get moaned at if they dare to take a night off, or their internet crashes
VIP warp ships are unable to respond to pleas from regular customers as owner is at work, asleep etc
Those ships with active crews/pilots sit idle for the lack of a simple mod to the programming.
MA should revisit this as maybe, just maybe, it would make space more active, and therefore easier for people to obtain travel when and where they need it. Travel = trade = ped exchanged between planets = healthy UNIVERSE.
and if there was seen to be more trade, more travel then perhaps some of those idle ships may come to life
The function of Officer of the Day could be set by owner by selecting a box on the guest list with one or at most 2 assignable, That way no need to give access to deed, and therefore no risk to vessel ownership.
And
On the subject of guest list, for goodness sake MA, would it really be so difficult to make them Alpha, or most recent first, or sortable or searchable (like friend list) that would help us find and remove those persons that have completed their journey.