Hey Jorge,
As Jim mentions above this is possible in both the AppMeasurement tag and H25/H26 versions of the standard SiteCatalyst tag.
Your original set up should work fine.
if(b.device=='ipad' || b.device=='iPad'){
b.account='nhhotelesipadapp';
}
Scope this tag to SiteCatalyst and map "account" to "s_account" in the SiteCatalyst Tag Mappings Section.
Jim's method will also work. It is essentially the same thing, but using "reportsuite" as the variable instead of "account."
The only caveat to the above methods would be that "device" would need to be defined prior to this code running that distinguishes what type of device is being used. If the device type is not being defined somewhere prior to this code then that will need to be added before these methods will work.
Hope this helps.