As far as setting it for many tokens on a map, I believe Aaron was going to work on getting this exposed to the API so that something like TokenMod could set it for you... and you could add {&select} criteria statements to get you the tokens you need (NPCs, PCs, tokens named "Bob the...", or all tokens on a map) without having to click on them. Not sure what the timing of that would be. As for the cursor changing to a cancel symbol... what kind of game is it (Jumpgate? Transmogged components, or existing? Was this working previously?) The more info the better it might help someone recognize what is going on -- but it may be that this requires a ticket to Roll20.