I think it would be hilarious and pretty damned fun to have a little mini wheel in the corner of the screen that you can access in addition to the regular convo wheel in the center of the screen. You could just stick to conversations OR you can add a little "personal effect" to any line. For example, the wheel would have choices such as... the following...
1..Light up a cigar
2. Scratch buttocks
3. Pick nose
4. Run hands nervously through hair
5. Put on a pair of shiny, glitter gloves
You would click on one of these, and then click your dialouge option. Your actions would come right before your dialogue choice, to add a little personality. Even better, after you pick the first action, you get a follow up one to use somewhere else in the conversation. Sorta like a second step. For example, following the list above, you could choose one of the following to go with the next response.
1. Blow smoke in their face
2. Scratch crotch and shrug helplessly
3. Flick booger on their face
4. Run hands nervously through their hair
5. Spin and do a little Michael Jackson "Heee hee!!" move
I'm just being silly, but it would be cool to have this level of rolepalying in a game. Ie, cool options to add movement or nuances to your dialogue choices. Would make for wonderful, subtle differences in multiple playthroughs, imo, even if the other characters in game never respond...or occasionally do to make it fun to try them all.