Android :: Gmail - No Reply As Option From Multiple Accounts?

I've seen the video for the Nexus One handling multiple Gmail accounts, that's fantastic, but what it does not show me, and what is killing me about my Eris, is that there is no "Reply As" drop down menu like there is in the regular Gmail app for Desktop OS. Ex. I have 3 email accounts (Hotmail, Work and Gmail) that I have setup on my Eris. Currently, the only one getting pushed to my phone is Gmail, which means that the other two are constantly polling for messages and causing a drain of battery, not to mention the hassle of having to enter into different mailboxes, apps to retrieve mail. I would love to be able to have my Gmail pop those other accounts and label them accordingly so that I can receive all my mail via Push from Gmail, saving on battery and making email management on my phone much easier.

However, this is not a possibility for me simply because I need to be able to Reply As the account that the msg was originally sent. Ex. Someone sends an email to my work email, and I'm on the road. I need to reply as me@work.com, not me@gmail.com. That would be really confusing to the sender, not to mention unprofessional for me. I've read some work arounds where some people have Gmail setup the way i described above, but also have their sep mail accounts setup on their phone w/ the Auto Polling set to manual. That way, they can manage their email in Gmail, but if they need to reply to one from a specific account, they open up the Mail for that account, manually refresh and find the msg and reply. Also, the built-in Mail apps have no ability to do batch operations such as "Mark as read" or "Delete all" functionaility, GMail does.

So, I can't be pumping through 30 emails a day w/o this feature. I'm doing it now on my Eris and trust me, it's more work that it's worth. I'm not one of those people that can just leave the Mail Icon sitting there with a number on it. It has to go away. Otherwise, I don't know if/when another email comes in. It could be important. This is especially important to me because I'm an IT Professional, and, not only do I need to get my email in a timely manner (Push is instant and therefore ideal), but I need to be able to reply as such. I've been looking at alternatives, but this seems to be the only/best way, and I'm really hoping that it's built-in to Gmail on Android 2.1, like it is on the Desktop OS version.