Awesome, I'm really glad to hear that you guys are enjoying the update!
Complaint regarding the mini-lag on "My Lands" has been noted; I already have a solution for it, will do my best not to forget and include it in the next version.
I had a feeling this would come up. Yes, activation of multiple items at once is planned for one of the future enhancement phases of the inventory section.
Can't guarantee it to be in the next release (there are just too many other features waiting to be built), but it will be added one day, I'm sure.
The inventory size is theoretically infinite, but its upgrade cost also has no limit. I personally don't believe anyone would get more than 10 additional slots as the price really gets steep at that point.
However, I obviously do not want to block someone generous enough to support the project, so it's possible to go beyond that amount.
Unfortunately, it is not possible to activate more than 10 items at this time, as I do not want a person with 1000 super magnets to collect resources from the entire country; that somewhat shifts the objective of our game to amassing items instead of actually travelling.
If my memory serves me well this subject has been brought up somewhere on this forum before, but I can't find a link...
The short answer is: there won't be a straightforward facility to send resources to another person on their own (there are just too many issues with this concept. Gold farming, abuse of newly created accounts etc. etc.), but I am positive that there will be other features that involve exchange of resources between players one way or another.