1) There is no way to distinguish a "Main" from an "Alt", aside from if you're using the Claim feature of LOTRoster and your members actually claim and classify their characters. However some form of filtering similar to what is implemented in the log viewer is something worth considering.
2) This would be beyond the scope of a simple roster, as an application (properly, not just doing a half-hearted attempt at) covering such features would be a whole project in itself. I know of one such project (RaidNinja), however its development has been discontinued a few months ago. If any other such tool exists and their author wants to integrate it with LOTRoster, feel free to have them get in touch with me so I can help them integrate the two applications.
Re.: filtering/integration
1) There is no way to distinguish a "Main" from an "Alt", aside from if you're using the Claim feature of LOTRoster and your members actually claim and classify their characters. However some form of filtering similar to what is implemented in the log viewer is something worth considering.
2) This would be beyond the scope of a simple roster, as an application (properly, not just doing a half-hearted attempt at) covering such features would be a whole project in itself. I know of one such project (RaidNinja), however its development has been discontinued a few months ago. If any other such tool exists and their author wants to integrate it with LOTRoster, feel free to have them get in touch with me so I can help them integrate the two applications.