Instead of individual timers for each bomb, I propose sequential timers.
This way, people can drop more than one bomb at a time again.
It will also be a lot easier to balance DPS by changing how long the timer ticks down for.
Sequential timing on bombs means that if you placed three bombs, the second one wouldn't start counting down until the first one exploded, then the third one wouldn't start counting down until the second one exploded.
Because right now, bomb usefulness is pretty much defined by blast radius.
Every other weapon deals more damage per charge attack.
And I realise that bombs can hit as many monsters as you can fit inside their blast radius, but that doesn't really change that killing that group of Wolvers is a lot easier and faster with a Gun or a Sword.
I mean, my 3-star Autogun cleared a Tier 3 danger room, but my Super Blast bomb couldn't even clear normal rooms in Tier 2.
And aside from that, bombs are the only weapon in the game you need to actually equip any specific bonuses to actually use effectively.
You know your weapon is gimped when you need at least three ULTRA charge time bonuses to even use it.
Anyway, that's just how I see things.
Post away.
Bombs does indeed need some tweaks, I was thinking giving bombs a special charge system instead of the existing one.
A full charge would make the maximum blast area and so on, maybe even a over charge for a special attack.