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sure! i have an android phone and just use the built-in timer it has, set to 3:25. google and online stopwatch are some good alternatives.
5/150/45/0 is a pretty good standard mag for a lot of characters, good call! if you wanna plan out your characters, i recommend grabbing rico's max stat academy if you have an android phone
as far as finding parties goes, just wait for normal games to pop up "low lvl", "new", "starting out", whatever, those are all pretty similar names to what you're looking for. you could also make a game and maybe specify a level range in the game name, but i've never tried that
the fastest way to switch characters is to hit alt+backspace to go back to the title screen and then log in again, unfortunately
you can switch character banks with the /cbank command with a number 1-8 after it, or do it from the launcher before you start up the game
yes, you can shoot traps really quickly using guns after placing them. it takes a little bit of practice but it's a really common technique for higher-leveled players
this is kind of a lot for me to answer! i don't mind or anything, but you might eventually have a question i'm not knowledgeable/pro/whatever enough to respond to. hit up the ephinea forums if you have any other questions, they're way more helpful than me!!