Multiple clients accessing same account


I have a twitter account that just follows a bunch of people and I need to stream this account Home Timeline on my mobile application.
If I store the account token/token_secret on the application and use OAuth authentication, it will be limited to 150 requests hour shared by all application users, which will easily run out after I get more than 150 active users. So I was wondering what you guys usually do in this situation.

[OBS: I thought about some approaches, but they are not good:
a) Use some auto retweet service on this account and get the stream via statuses/user_timeline without authorization. Not sure if this auto retweet services are legal and reliable.
b) Call statuses/user_timeline without authorization for every person this account follows. It is not flexible and consumes much data.]

Thanks and Regards,