The R4 is supposed to be able to run nds homebrew, as are all other slot-1 solutions. I haven't tried it, though. I know my Acekard2 runs homebrew fine.
For GBA games, the best solution is the EZFlash 3-in-1 cartridge. For the R4, you need an additional GBA loader, which might be hard to find...
Most internal memory card readers are connected on the internal USB hub. That means that you have to treat the card like a USB flashdrive. Search for a Linux distribution that is suitable for flash drive installation (try Puppy Linux) and follow the directions, but point it to the memorycard...
I voted "YES" but it depends on where the bad grammar is used.
On a forum like this, it doesn't make much difference, it's just annoying.
In rocket science or nuclear science, grammar is really important, as is spelling!
Did you realise that as long as the unit is listed on eBay you can't sell it otherwise? If someones buys it through eBay, you have a binding contract to sell, as well as the buyer has a binding contract to buy.Retracting an item from eBay isn't easy and will result in negative feedback.