I found that on really slow systems, 225% was a good speed to set it at.
Also, with the plug-ins: Essentially, every element of the game has a resource type and number, such as say, Pict #180. Now, when the game loads, it can only load one item per resource number, and anything in the plug-in folder is loaded instead of its coresponding resource type number. Now, if you have two plug-ins with items in exactly the same spot, then I believe the plug-in that is alphabetically first gets to load its item into that slot. Now, most large plug-ins will have conflits with eachother, but usually they do not take up the last couple of spots of any given resource. This is what a smart developer can take advantage of if he is just trying to add a single item such as credit sticks, for instance (which is essentially just a plug so that people who are unregistered won't have to lose too much money from Capitan Hector, you just buy credit sticks and take a little loss of money instead of millions Capitan takes away ;)). Anyway, if a developer is smart, he will just assign one of the very last slots to that plug-in. Then you have plug-ins like lightning jump which makes it almost instantaneous to jump to another system. Now what the developer does with that is add a character at the beginning of the plug-in so that it is alphabetically first so that even if another plug-in modifies the sound of the jump, Lightning Jump will have preference.
Anyway, that is just the basic nohow of plug-ins. If you learn to use ResEdit, then you can make certain small plugs compatible by shifting a conflicting resource down a number or two. But all in all, you can usually use one big plug, one small plug (some cheat plugs), and one plug that is purposly alphabetically first.
If for some reason you have a problem with getting a couple of plugs to work and want help making them work, just give me an e-mail or IM and I'll see if I can walk you through the process.
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To come is to go.
To leave is to enter.
To die is to live.
Death comes for us all.