Nevada is well aware of these concerns. The technical standards are available at http://gaming.nv.gov/stats_regs/reg14_tech_stnds.pdf. Many other jurisdictions have similar rules. Following is the standard that covers making changes to the software on a gaming machine from a remote server. The casino can provide your favorite games on demand if you've authorized it to. Otherwise, the machine has to be idle for four minutes before and after the change.

1.140 Conditions for changing active software on a conventional gaming device or client station that is part of a system supported or system based game.
1. Active software consists of all the games currently available for immediate play by the patron on the conventional gaming device or client station. For this section, immediate play means games that do not require additional software or a change in game configuration such as denomination, maximum wager, payback percentage, etc. prior to the patron being able to initiate play.
2. The conventional gaming device or client station must be in the idle mode with no errors or tilts, no play and no credits on the machine for at least 4 minutes. After this time, the conventional gaming device or client station must be disabled and rendered unplayable for at least 4 minutes. During the time the machine is disabled a message must be displayed on a video screen or other appropriate display device notifying the patron that the game configuration has been changed.
3. If the change in the active software is the direct result of a player request, the delay requirements of section 2 of this technical standard may be ignored. However, the active software may not be changed if an error or tilt exists on the conventional gaming device or client station.