Thank you very much for the answer.
Sorry if the argument has already been discussed many times. I tried to use the "search" field, but it give me only a topic (about "how make rolemaster better"), and in there multiclassing was barely discussed.
I was trying to recreate different character concepts not covered from the core classes, without the need of new classes (i.e. a sort of "magent" using a thief/mentalist multiclass, without the need of a "magent" class). Plus, I like the idea that a character can, after some levels, chooses to change "focus".
From what you say, it seems that the HARP multiclassing is unbalanced and problematic too (i.e. access to "sphere"). Or are there differences that my limited experience with both systems don't let me see?
IIRC the normal search just does current topic and you have to do an archive search to go into the old stuff.
No problem there has juts been a lot of posts on this and I do not remember what everyone has said before.
I agree with you that it is tougher to create a concept in RMC or RX then in RMSS. As RMSS you can usually do this with a Training Package (TP). RMC is tougher as you would in general have to adjust skill costs and allow access to spell lists. Which have been does IIRC by creating a talent frame work or a TP framework and let them do it that way.
Another option in which I learned RM2 was to use the professions from RMSS in RM2 and use the skill costs that map over. You use a 100 DP scale vs what they use in RMC as the DP costs are higher and you can use the TP idea from RMSS. You use the stat bonus rules from RMC, the level bonus rules from RMC (You will have to create some of your own for the classes you do not have), the skill rules from RMC and the idea of TP's from RMSS. I think it worked OK.
For Races some of the old Rolemaster Companions (RoCo) had races info in them. I do not know of another source right off the top of my head.
I would buy Spell law also has it has spells in one place and has some nifty rules in it that can help a GM a lot.
I also like PDF's so I can create a binder for each player so they have everything they need in one place. It can just get $$ for spell users as they get more spell lists.
Does that help at all?
MDC
BTW, I am mainly a RMSS/FRP player and some might consider me biased on the topic. But IMO your question's are one of the big areas that IMO RMSS fixes in RM2, ie no need to create a new profession to simulate something just create a TP or use a profession and change some minor things so it now fits what you have in mind.
Note: IMO the GM should design the new profession not players as players you can min max things better and GM's tend to think more of balance.
MDC